Original subtitles

How was your day? Someone murdered a tour guide in a church.

I mean, in terms of our investigation.

Well, I've actually been looking over the original crime scene.

No, John, what you were supposed to do today

is get closer to DI Carter.

This Russell character magically appeared

at the exact same time as James vanished.

I was engaged.

She died.

Her name was Mandy Ziegler.

A-As in...?

Helped to fast-track my transfer.

That's all I've ever asked of him.

The Sinclair case

is Roger Sinclair.

Single man, disturbed a burglar,

who killed himself in a panic of self-preservation.

Sinclair was a conspiracy theorist,

and a pretty batty one at that.

I have been looking into this guy they arrested, Rhys Bowen.

He lives with his mother.

He was with me that whole evening,

as I told the police,

but they wouldn't believe me.

He's dead! I was supposed to talk to him today.

What if they knew that?

The man was facing life in prison for a crime he didn't commit.

Shadowy figures

orchestrating a suicide

inside a guarded prison cell?

No, it's too much,

i-it's too big.

Symphony 5 in C Minor by Ludwig van Beethoven

All right?

Oh, my God.

Marty! Marty!

John, wake up.

Argh! W-What you doing?

The famous detective awakes!

Congratulations. Page five.

That's me.

Not according to that it isn't.

According to that, it's "supercop" DCI James Taylor.

"Supercop?" Is that what it says?

What on earth were you thinking?

How's this my fault?

I didn't know I was going to be in the paper.

You gave them a quote, John!

"As with most investigations of this nature,

"it was simply a case of whittling down the variables."

That woman was a journalist?!

Who did you think she was?

A fan?

You can't go plastering yourself all over the newspaper like this!

God only knows who might have seen this.

Maybe Dad has.

And if he has, maybe he'll get in touch.

Oh, Henry, you don't understand,

we have to be careful about this sort of thing.

Why? Because he told us to?

He also told us to leave town.

We didn't do that, did we?

If he sees we haven't been following his instructions,

maybe it'll force his hand.

Bring him home.

You do want him to come home, don't you, Mum?

Henry!

Forget it.

Oh, it really does say "supercop".

Have you got anywhere with that cypher in James' notebook?

Anywhere at all?

Great. Good. So, since you've been here,

you've solved four murders and not a single letter of that thing?

James is a lot cleverer than most murderers,

not to mention me.

James is no cleverer than you. He never was.

He's just much more...

You know what I mean.

Look, the cypher's a puzzle.

Solving puzzles is literally what you do.

I need the source code.

Well, work out what and where it is, then!

Look, like it or not,

you and James think in the same way.

Where would you hide it?

Probably in plain sight.

Right, well, look there, then!

OK.

Can I get up now, please?

Yes.

I'm in my pyjamas.

Do me a favour, John.

Don't solve any murders today.

I'll try really hard not to - I promise.

Health and safety.

Can't let you in without it.

Right. Do they work?

Was he wearing one?

Well...

Guv, it's almost certainly a workplace accident.

Let's just get it over with, get it passed on

and get back to the station.

Morning, Guv. Sir.

Sergeant Finch is trying to access the CCTV.

There are plenty of cameras dotted around the site.

Staff-wise, there were only five others here

at the time of the incident.

I don't think that's quite right, sir.

Do you mind if I...?

Here, let me just... Let me just...

Don't twist it. It goes round the ears.

Five, including you? No, it's just...

Did you see it? No, but I heard it.

Marty! Call Connor!

No, careful! Argh!

Oh, sorry, sir. Ow! Oh, sorry, sir. I think it's a hair.

Yeah, well, OK. Yes, yes, constable.

I think the DCI can manage.

Why don't you go and take some statements?

And perhaps you can take us up to where he fell.

"Up"?

You scared of heights, Detective?

Nobody's ever given me a good reason not to be.

Running off a skeleton crew at the moment,

at least for phase one.

It's a budget thing.

I promise there'll be some more hands down the line.

So, who were the other four on-site this morning?

Er...

Er, well...

It's that lot down there.

I'm going to need a list of names.

Well, I can give you the rota.

You've got Gary Jennings. He was on the mixers up here.

Marty! Call Connor!

Er, Zara Bassett, Ojay Turner -

they were next floor up.

Pretty much right below where he, er...

Sorry, excuse me.

T-That sign had a skull on it.

What?

Oh, yeah, yeah, don't worry about it.

This platform's fine.

I'm not actually sure why that was up here -

it wasn't meant to be.

And then there was Stefan.

Polish kid.

He got the worst of it.

He hasn't been here that long.

He actually saw it.

And what about the deceased?

Er, Martin Symes. What can you tell us? Marty? Not a lot.

He was a hard worker, good laugh.

Bit of a lad. A wind-up-merchant, you know?

Absolute tragedy.

There you go.

That's where he fell.

What was he actually doing up here?

Beats me.

According to the rota, nobody should've been.

Look, the bolts have worked loose.

I mean, he must have leant against it and...

Well, it certainly looks like an accident, don't it?

Good. Agreed.

Can we go back down now?

What are you doing?! Nothing, I was just...

Looks like the fuse has blown on this thing.

Like we haven't had enough setbacks already!

More skulls.

Why don't they just say, "No entry"?

Why do they have to be so graphic and portentous?

Actually, that one's not meant to be up either.

It isn't?

Guv, is everything all right?

Can we please go back down now?

Ah, there you are, sirs.

Not much help, I'm afraid.

Didn't catch the accident.

This here's the last footage, at around 6am.

Nobody was even on-site then.

They're motion sensitive.

Fox probably set it off.

Listen, is this going to take much longer?

Look, I know you've got a job to do, but so have we.

I've got half a dozen workers out there sat around doing nothing.

Look, they're all shook-up,

but they want to work.

And we're on a tight schedule.

I'm afraid that's the least of your problems.

What? What do you mean?

Well, for a start, one of them is a murderer.

So, not an accident? Are you sure?

Absolutely. Well, there certainly were quiet a few things

that don't add up.

Like the warning signs blocking various paths.

They're missing from the CCTV earlier that morning,

meaning someone must've put them up afterwards,

when there were only five people on the site,

all of whom claim it wasn't them.

Is that it?

Well, yes.

Oh, no! There's the generator thing up where he fell!

That had been deliberately tampered with,

completely re-wired.

How do you know that?

Well you don't have to be a trained electrician

to know that red goes in red, green goes in green

and blue goes in blue.

This was all over the place!

Red was in green, green was in orange,

I don't even want to think about where blue was going!

It was murder.

Believe me, I wish it wasn't.

Yes, well, I wish it wasn't, too!

You'll be tied up for days now.

No, I won't.

There's only five suspects. It shouldn't be hard.

Goodness, that article really has gone to your head, hasn't it?

No! Well, I mean, it's always nice to get positive feedback, but...

Oh, no, that computer woman's here.

What computer woman?

Holly Pinder.

She almost caught me this morning.

Caught you doing what?

Going through the Sinclair report.

Shift, I need that computer.

I need to install an update on it.

In fact, I need to install updates on half the ones in the station,

so if you don't mind.

Er, just a second.

Just a second.

Er...

Wow.

That must've been some serious porn you had on there.

Are you laughing?

No, sorry.

OK, good. Because I don't think this woman likes me very much -

or James anyway.

She's always giving me funny looks

and sarcastic answers to perfectly normal questions.

Well, that could be a John thing rather than a James thing.

I mean, let's be honest,

you've had funny looks and sarcastic responses all your life.

Oh.

No, I didn't mean that. I was just saying...

No, no, it's fine, you're probably right.

I'd better go.

Ooh!

Look, I've nearly lost a day already.

I'm not interested in any of that, OK?

This happens to be a crime scene that you're busy cementing over,

and I'm ordering you to stop.

You can't order me to do anything.

Oh, she can. She's really good at it.

Well, you are. Oh, here comes re-enforcement.

Look, this has already been cleared by your gaffer, all right?

So you take it up with him if you need to.

Her.

Him, her, whatever.

Listen, love, I've worked sites like this all my life

and I've seen a million accidents like this one.

And yet they keep employing you!

What? You two, head back to the station, please.

Sir.

We need to talk to everyone that was on-site this morning.

Well, we're not downing tools.

Heaven forbid.

"Listen, love"?

I really hope he did it.

It'd bring me great pleasure to arrest that man.

Yeah, but it's my turn, isn't it?

You said it was my turn!

What?

This ain't coming off our breaks, is it?

It's just a few questions.

All right. Well, you'd better get on with them, then,

cos it was obviously an accident.

It's not something we want to talk about too much,

cos it could've been any of us. It wasn't an accident.

Yeah, the foreman mentioned you.

What is it you're saying?

Do you think he was pushed or something?

We certainly need to explore the possibility,

if only to shut it down.

So, a good place to start would be if either of you

know of any reason why someone might want to harm Marty.

Aside from the fact that he was an arsehole, you mean?

Christ, Zee!

Look, I wouldn't wish this on my worst enemy,

but he was an arsehole.

She used to go out with him. No, I didn't.

I went on one date with him six months back,

cos he wouldn't take "no" for an answer.

I think it was a bit more than a date. Really?

Is that what he told you all, is it?

Like I say, arsehole.

Look, you get it, all right?

He was a bit of a lad.

He worked hard, played hard - just loved winding people up.

He was harmless. It was all in good fun.

Tell that to Stefan.

Marty's idea of winding people up involved convincing them

they were about to be deported.

Stefan Kaminski?

Yeah. Yeah, Marty had been whacking over a load of emails to him,

saying he was from immigration

and talking about work permits and that.

Had Stefan completely convinced.

Why on earth would he do that?

For a laugh.

No harm in it. It was a joke. How is it a joke?

It doesn't follow any of the normal or traditional structures

of a joke,

not as I've been led to understand them anyway.

I guess everything's a joke as long as you're not the butt of it.

And I'm guessing you never have been?

Guess again. He once had me totally convinced

that our syndicate had won the lottery.

Made a ticket up and everything.

I was this close to asking my girlfriend to marry me.

It was a lucky escape.

Yeah, you're telling me. I meant for her.

You see, that's a joke.

You set up a false premise, then you subvert it.

So, when did you both get on-site this morning?

Seven-ish, for a 7:30 start.

And did either of you see Marty?

No.

Well... not until it was too late.

And what about you? Yeah.

Yeah, I saw him. I spoke to him.

Yeah, I told your little bobby this.

Only reason I was on the mixer this morning

was cos Marty wanted to swap with me.

I was meant to be on riveting.

Wait a minute, are you saying that you were supposed

to be up there, where he fell?

No, riveting's on G5. That's F6.

I don't think anyone was meant to be up there today.

Sorry, G5, F6?

Oh, the site's divided up into zones.

There's always a rota up when we get here,

but we often just chop and change between us.

But if you're all always swapping around,

how does anyone know what anybody else is doing?

Sort of just becomes second nature.

Instinctive. Yes, I see.

Like ants.

Excuse me? Well, in a nest or a hive

where there are thousands of organisms...

So, would either of you happen to know which zone

we can locate Stefan in right now?

Marty did apologise.

Ojay made him.

Too right I did!

Stefan here spent a solid week convinced

he was being booted out the country.

I don't mind a joke, me,

but this is a dangerous job.

Yeah, you don't want to be operating heavy machinery next to a guy

with a head-full of that sort of worry.

And... when exactly was this apology?

Yesterday.

End of shift.

I said it was OK. And was it?

Doesn't matter now.

No.

I mean, nobody wanted this.

Someone did.

So, did either of you see him this morning?

Yeah, spoke to him first thing as it goes.

We were both in early.

He was whinging about the rota.

Wasn't happy with all the swapsies going on.

Although he still tried to swap with me.

I said, "No."

How about yourself? Did you speak to Marty at all this morning?

No. I saw him, though.

Twice.

First time was about ten minutes before the accident.

I was on brick-laying.

Tried to take a short cut between E1 and H1,

but there was a sign blocking my way

so I had to go find another way to get round.

Marty was up on the third floor -

testing the pneumatic riveter, I think.

So, you say you saw him twice?

When was the second time?

Oh. Yes, of course.

I'm sorry, that must have been...

It was.

I've never seen another man die before.

It was so...

..sudden.

One minute, there was this...

..empty space before me and...

And then suddenly...

Er, Guv?

Guv!

Oh, er, sorry.

What is this, please?

What do you mean, "What is it?"

It's a chute, isn't it?

A chute, yes.

Where does it go?

It goes down.

You going to fill me in on exactly what it is

we're looking for here, Guv?

Whatever is in it, of course.

The top of it is right next to the crime-scene itself.

So it's possible that something...

Look, do you think we could start calling it

the "incident location"?

Only I'm starting to think more and more that...

Aha! There! See?

What do you call that?

It's a plastic bottle.

It's for a water dispenser.

There's several dotted around the site.

Yes, but what's it doing in here?

It's a skip.

Traditionally that's where you put rubbish,

like empty plastic bottles.

Or perhaps it was a full plastic bottle

when it was taken up there,

then an empty one when it was dropped down the chute.

Someone poured it onto the generator.

You must've noticed how wet the floor was.

That could've been...

You don't really expect to be able to move a two-tonne skip,

do you, Guv?

Well, I was going to give it a go. Yeah.

Oh, no!

That's no good.

That's no good at all!

What? Oh!

Guv, wait.

Wait, Guv.

Oi! Run, Forrest!

Guv, I really do think we should entertain the possibility

that this was an accident.

Excuse me! Where...?

Where do you think you're taking that?

That's evidence, isn't it?

They can't take away evidence, can they? "Evidence" of what?

It's a burnt-out generator, like I told you earlier.

What are you doing?

You've pulled all the wires out! Yeah, to move it.

They were all in the wrong place anyway.

Well, can you put them all back again, please?

Put them back?

In the wrong place?

Forget it, I'll do it.

Er, it is safe?

Of course it's safe. It's completely dead.

What's he...?

He can't actually remember

where each and every one of those wires went?

Oh, believe me, he can.

There!

Are you a trained electrician?

As a matter of fact, I am. Excellent.

If this was wired like this and wasn't already dead,

what would happen if you turned it on?

Well, the fuse would blow. Which it did.

And what would happen to the person who pressed the button?

And let's assume, for the sake of argument,

that the generator was wet at the time.

I don't know, they'd get a very nasty shock,

but it wouldn't kill 'em.

Just knock them backwards,

straight into a safety rail

that had already had several of its bolts deliberately worked loose?

Ahem. OK, then.

I want that generator taken back off that truck.

Listen, mate... No, you listen, mate.

This is a crime scene, that is evidence.

It is not leaving this site.

And you're going to come with us and answer some questions.

Understood?

Thank you. Guv.

So, this is everything from his locker?

Yeah.

No idea what we're supposed to do with it all.

Well, given your keenness to remove evidence from the scene,

I'm surprised you didn't just chuck it.

Oh, I see.

So, I do my job,

arrange for a burned out generator to be replaced -

like it should be - and suddenly that makes me a suspect?

You're a suspect because you're one of only five people

who could've committed the murder.

This is a Ludwig.

A what?

Hmm?

Oh, he's a world-famous puzzle setter.

Quite the legend in his field.

These puzzles have all been done.

Well, maybe some of the lads have been doing them on their break.

Really?

None of them seemed very puzzle-solvey.

Sorry? All right, moving on.

You said earlier you didn't think anybody was on the site at 6am,

when the cameras went off.

What time did you get here?

Half past.

Nobody else was here.

Well, somebody was.

Because somebody had spent the previous half hour

setting up the Rube Goldbergian sequence of events

that would eventually lead to Marty's death.

Unless that somebody was you.

What?

I don't even know what Ruby-Golden-whatever is!

Have you ever played Mouse Trap?

The board game?

Hasbro, 1963?

No. Really?!

You've missed out.

What's he...?

Don't worry about him.

So, who was the first person to arrive after you?

I should think it was Marty.

I didn't speak to him.

I was on a call.

At 6:30 in the morning?

I was checking out flights if you must know.

Look, it's got nothing to do with your investigation,

so I would appreciate if you kept this to yourself.

But I've been offered an interview for a new job,

overseeing the construction of a luxury hotel.

Abroad. "Abroad" where?

Las Vegas. I shouldn't have thought so.

I suspect that was just a joke.

A joke?

Yes. People are quite cavalier with the definition of that word here.

Email, was it?

Does rather fit Marty's MO, I'm afraid.

A joke? Yes.

Unfortunately for you, one that gives you a motive.

Although, unfortunately for us,

it's the same motive as everyone else.

Which is very inconvenient.

What motive? What are you talking about?

I believe one of your employees summed it up earlier -

Marty was an A-triple-asterisk-hole.

This whole rota thing of yours is ludicrous.

How does anyone make head or tail of it?

You've got someone who's supposed to be on G4 going to H1,

someone who was meant to be at C3 going to F6,

and someone from A1 who's gone so far down the alphabet,

I'm surprised their zone's not in hieroglyphics.

Let me ask you something, is there a single person that works

on this site who is ever where they're supposed to be?

Doesn't look like it, sir, no.

They chop and swap at will.

No rhyme nor reason to it.

Madness.

Right, I've got it open.

I've gone right through it.

This guy had a lot of email accounts,

all under different names.

I found your deportation papers one.

And the fictitious Vegas job.

I then did a data-mine on all his social media.

He had a lot of accounts there, too,

but none in his own profile.

Some are men, some are women.

All the photo's have been nicked from somewhere else

and all the names have been made up.

Hmm, he was a catfish.

You, er... You do know what a catfish is, don't you, sir?

I think you and everyone else here knows full well

that I'm about to state incorrectly that it's a type of fish.

Well, it's someone who pretends to be somebody they're not.

I'm going to go through all the accounts he's targeted

and see if any more of your suspects are amongst them.

Thank you, Holly.

Guv, do you want to...?

Hmm?

Guv? Oh, er, yes.

So, the murder was surprisingly well-planned...

..considering...

..but there was still a fair amount of evidence left behind -

the re-wired generator, the pool of water,

the loosened bolts.

And who's all this evidence pointing to, sir?

I don't know yet.

So, how is it evidence?

Sergeant Finch, is there something you'd like to get

off your chest?

Yes, please.

May I? Thank you.

OK, correct me if I'm wrong, sir,

but presumably your theory is that the killer set this "deathtrap"

up on the fourth storey,

and then manipulated or coaxed the victim

into walking into it?

Yes, that's right. Ah!

Oh, no. Well done.

So, how did they guarantee

that nobody else would walk into it first?

Our killer just wouldn't just have to manipulate the victim -

they'd have to manipulate the movements

of every single other person on the site, too.

Is that even possible?

Of course it's possible.

It is possible, isn't it, guv?

I-It's possible, yes.

But presuming that our killer was someone

of very high intelligence.

But they'd have to be a genius.

Guv?

Could it all just be a coincidence?

Could what all just be a coincidence?

Is it possible that it really was...

..just an accident?

What? What are you talking about?

You know it wasn't.

Guv?

You know it wasn't.

Light!

Light, light, light!

No, I'm not asking you to...

Off! Turn it off! Turn it off!

You can't just walk in here, you know that.

The sign wasn't up.

Well, I thought that you were out all day.

I was.

It's nearly five. Is it?!

Yes, it is.

Have you heard anything?

"Heard anything"? From Dad?

The article in the paper?

Oh, no, I doubt your father... So you haven't heard anything?

I would've told you if I had.

Would you?

You never told me that he left.

I thought we'd had this conversation.

I'm sensing that you have had a bad day.

You're not the only one.

It will be OK.

Your Uncle John...

He is not my dad!

You might be able to pretend that he is,

sitting there on the bed reading the paper together, but I can't!

Go to your room. Come on, Mum.

I'm 15, you can't just... I said, "Go to your room."

Hi.

Have you been crying?

No. Allergies.

What are you allergic to?

Life.

Yes. Me, too.

Fine. We'll worry about you, then, shall we?

What if I can't solve the cypher?

What if I actually can't do any of this?

James is cleverer than me. He always has been.

He... He's always better than me at everything.

John, has something happened?

This building site murder.

I can't solve it.

It seemed planned but also sloppy.

Evidence everywhere indicating that it wasn't an accident.

But that was no mistake.

They just didn't care,

because they knew I could never prove it.

So it's a game to them.

They're just laughing at me.

Like they always did.

"Always did"?

Yes, they're just a grown-up version of all the kids

that would bully me at the bus stop.

Nothing's changed.

John, what are you trying to say?

I'm trying to say that I'm not the smartest guy in the room.

I'm not even the smartest guy on a building site.

So, who am I?

Well, a bit of a snob judging by that last comment.

Apart from that, you are someone completely untrained

who's just solved several murders without batting an eye.

Perhaps I just got lucky.

You don't believe in luck!

You're the only person to have ever found a four-leaf clover

and not even want it.

The four-leaf clover?

You remember that?

Vaguely.

I gave it to you in the end.

You were going to laminate it and keep it forever.

Yes, well, I was a sentimental idiot back then.

Don't say it like that. You still are.

Thank you.

You're welcome.

Ahem!

Oh, it's just you.

What's up?

I think your mum is cross with me.

Yeah, I think she's cross with me, too.

I highly doubt that.

Don't touch that!

Sorry.

It's just, I'm in the middle of a game.

Who with?

Oh, I see.

Not that we really played it together.

He'd just sort of come in while I was asleep and move a piece.

I'd wake up the next day, move another.

Which side are you?

Black.

So your last move was knight to queen one?

Yeah.

How did you know that?

It's difficult to explain. It's...

It's a type of puzzle called reverse chess.

I invented it actually.

You're presented with a board in the middle of a game

but, instead of having to work out what comes next,

you use maths, probability and reason

to deduce what came before.

It didn't really catch on.

Nobody could ever solve them.

Your mother is crying in the kitchen.

What?

Er...

And you've just left her there?

I'm not good at dealing with that sort of thing.

Chess, on the other hand - I've always been good at that.

One game I could always beat your dad at.

That and Mouse Trap.

Is she crying because of me?

No.

Nor because of me.

She's crying because she's frustrated, scared,

and the person she wants to take it all out on isn't here.

I expect you can relate to that.

Mum?

Henry, please don't.

I can't go another round.

I'm sorry.

You have nothing to be sorry for.

Neither do you.

Thank you.

Don't get used to it.

Right, then - let's start with one central, and indisputable, fact.

This wasn't an accident.

This was a murder.

And an especially ingenious one at that,

so... well done.

Marty Symes was led to his death by a series

of supposedly impromptu rota swaps

guaranteeing that he would be the one to end up by the generator.

And the genius of it all - and it was genius -

was that killer's manipulation of all your movements

was tertiary at best.

Most of you were inadvertently manipulating each other.

What? The killer, with an impressive level of psychological insight,

accurately predicted who would swap with who and in what order,

leaving his or her own machinations hidden.

If it helps, I've prepared a practical demonstration...

..I think.

Constable Evans, did you...?

Oh, er...

Yes, sir.

Excellent.

Now, if all this is starting to sound like a game -

that's because, in essence, it was.

You were all pawns.

And by a happy coincidence,

your impractical grid system here

contains exactly the same number of squares as...

What is this?

Well, it's a chess set, sir.

I had to go to the garage. It's all they had.

They had loads of Connect Fours.

We'll keep that in mind for any future cases, Constable.

My little girl's got that set.

Right, then. You should like this.

It's a criminally under-appreciated form of puzzle

known as reverse chess.

We start with the end-game and we work backwards.

Marty Symes last move was to F6 -

ie, the crime scene.

The rest of you, you wound up in these spaces,

where not one of you was meant to be.

Meaning that the game had already been played

without any of you knowing.

So let's play it again, shall we?

Backwards.

Marty found himself up in F6

because the riveter in G5 had no power.

But he was only in G5

because he'd swapped with Gary from C3.

And Gary only wound up in G5

because he'd swapped with Ojay from F4.

Which should have left Gary here with Stefan in G4,

except Ojay had asked Stefan to swap with Zara in H1.

Which leads us to the only move that really counts -

the first one.

The one that started the sequence of events

that eventually led to Marty heading off to the pneumatic riveter,

a pneumatic riveter that was, itself, powered by a generator

on the fourth storey.

Or rather, in this instance, not being powered by it.

Which of course was further manipulation by the killer,

designed to move their target one storey higher

to what my colleagues colourfully referred to as a "deathtrap".

A generator that had been deliberately re-wired,

railing bolts that had been surreptitiously loosened

and an 18-litre bottle of water that had been poured out

around the base of the generator

and then disposed of down the nearby chute.

And the rest, as they say, is tragedy.

Ah!

And all from just one move.

The opening gambit.

Yours.

Wait, what?

You don't think that I had anything to do with this?

Of course not. You were just the first piece to move, that's all.

But it wasn't your hand that moved it.

Was it?

You were meant to be in H1.

You did swap with me.

Insisted on it, I would wager.

So...

Look, I ain't going to pretend like I followed a word of that, mate.

But what I am going to ask is why the hell

I'd want to kill Marty?

Quite why anybody ever wants to kill anyone is a mystery to me.

I've certainly never wanted to.

But since you ask, I'm going to go with pride and arrogance.

I do believe that you took the "joke"

of the lottery win in your stride,

even if you embarrassed yourself slightly

by proposing to your girlfriend as a result.

Almost proposing to my girlfriend.

No, actually proposing.

Our computer woman has seen the messages.

I was wondering, through -

when exactly did you discover that you never even had a girlfriend?

That it had just been Marty all along?

We've had all the IPs traced.

We know you were one of Marty's catfish victims.

Even though you were using a fake profile

and photo yourself.

Yes, ironically, you thought you were catfishing "her".

In fairness, making the joke a lot more layered

than I gave it credit for.

OK, well, if you must know,

I caught a glimpse of his phone on a break, saw the profile.

So, what? He was pranking me while I was pranking him.

It's not a reason to murder, is it?

Not for a normal person, no.

But you're not a normal person, are you?

You're a man of enviable intellect who hides it all

behind spitting and saying "mate" a lot.

A man who couldn't bare to be beaten by someone

so much stupider than him.

That's it?

That's my motive?

That's the motive of a complete sociopath.

Yes. It is.

Right, you going to bring this little chess set

to trial with you, are you?

Oh, no, we've got some actual real evidence to go along with it.

The water bottle that you disposed of down the chute

was tested for DNA.

Sergeant Finch got the results back this morning -

didn't you, Sergeant?

Yes, sir. It's a match.

All right. What was that, then?

The bottle I took from that drinks dispenser over there?

The empty one that I chucked in the skip?

From the fourth storey, via the chute.

Nah, mate - from the ground, via my hands.

Never even been up to F6 - not once.

Your move.

My move.

Yes.

Well, come on, then!

Right, then.

Dispose of this for me, will you?

You don't really expect to be able to move a two-tonne skip, do you?

I thought I'd give it a go.

Congratulations, Detective.

Thank you.

I appreciate that.

Checkmate.

I believe this is yours.

I signed it for you.

Constable.

Right.

Er, that's not the foreman, though, is it?

What? Oh, no, it's just...

It was supposed to be my turn.

Gary Jennings, I'm arresting you on suspicion of murder.

You do not have to say anything,

but it may harm your defence if you do not mention,

when questioned, something that you later rely on in court.

Yes, sir.

Yes, sir.

Signed confession. Case closed.

It was DCI Taylor.

I can assure you that's no longer an issue.

Yes, sir.

What have you got there, then?

Nothing.

You know, it's the craziest thing.

I've been doing a security sweep on all our systems,

and do you know what I've found?

Chief Constable Ziegler

has been accessing a lot of files lately from your computer,

even on the days he's not been there.

So, how do you suppose he did that?

Don't worry, I've wiped the system.

Why would you do that?

I don't know.

But I won't do it again.

Hello.

Oh, dear. What's the matter?

The computer woman knows what I've been doing.

What? Using Ziegler's log-in,

accessing files I shouldn't be.

But she's covered it up,

wiped it all from the computers.

So, what does that mean?

Is she a goodie or a baddie?

I don't know.

But I'm going to find out.

What's all that?

Ah, it's for the cypher.

I've already made a start.

I'm going through it all page by page,

book by book, night after night if I have to -

no matter how long it takes.

You haven't given up, then?

Of course not.

Why would I?

I'm really good at this. Don't you read the paper?

Right, speaking of homework...

Good lad.

Homework, my arse.

Do you fancy taking an hour off?

We could watch a film. You can choose?

I-I'm all right, thanks. I...

Hello?

What do you think you're playing at?!

I'm not sure?

I saw you in the paper!

Why are you back there?

I mean, what the hell do you think you're doing?!

James?

I'm sorry, it's a really bad line.

I...

Who is this?

Come in.

Oh, James just got a funny phone call

from a funny phone number.

Who? Who was it? Was it him?

No, it was some man. Well, what did he s...?

Sorry, what are you doing?

Well, you're in your, you know, nightie.

I don't...

Why don't I get up, and you go and make us both a coffee?

What's going on? What's happening? Somebody's called?

Oh, no. It wasn't Dad.

I'm sure it's nothing to worry about.

You go back to bed.

John, you'd better make that three coffees!

Ah, there you are, Guv. Let's go.

Go where? Back to school.

Looks like a suicide.

There's even a note. Head of English, eh?

Two double negatives, no apostrophes.

James' phone has been cracked.

Someone's tampered with the software.

Ah, Mr Todd?

It's Taylor, Sir.

Yes! I remember the Taylor boys!

Jacob and... Joshua.

No, sir, James and John.

That's right!

The nutty professor.

I wouldn't listen to much of what he says.

I do hate bullies.

Are you police? Detectives, yes.

What, both of you?

This week was supposed to be a new beginning.

Oh, I've got it. It's an address in Wales.

You're not going to go, are you, Mum?

How did you... get my number?

Lucy? What are you doing here?

Ode To Joy from Ninth Symphony by Ludwig van Beethoven

♪ Freude, schoner Gotterfunken

♪ Tochter aus Elysium

♪ Wir betreten feuertrunken

♪ Himmlische, dein Heiligtum!

♪ Deine Zauber binden wieder

♪ Was die Mode streng geteilt

♪ Alle Menschen werden Bruder

♪ Wo dein sanfter Flugel weilt! ♪