(sirens wailing in background) Of course they're here.

SUZIE: What's going on?

JUDITH: There's been a death at the sailing club.

Is it murder?

We need to understand who might want him dead and why.

There's something you need to see.

(on phone): Evidence that suggests it wasn't an accident.

Sounds like he rubbed a few people up the wrong way.

If this is my last case as S.I.O., I've got to solve it.

JUDITH: I may just see if the police missed anything.

How are you going to do that without a warrant?

Afternoon.

♪ ♪ ♪ ♪ (thunder claps) (whimpers) (click) ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ Hello, old friend.

♪ ♪ I met Suzie on the towpath.

SUZIE: Thought I'd come and see what all the fuss was about.

(whispers): Wow.

Oh, blimey.

He don't look too well.

Well, Fred's been dead for 1,500 years.

Fred?

Shouldn't it be something like Ethelred, or Osbert?

Huh, I thought he looked like a Fred.

Uh, Mr. Eddingham found him with his trusty metal detector.

EDDINGHAM: What I thought was yet another bit of old piping turned out to be Fred's ceremonial sword.

Nice one!

So, who owns the land?

It was gifted to the landlady at the Bounty pub by an old regular.

But it's designated grazing land.

More or less worthless to them, unfortunately.

And she gave us permission to set up the dig.

Thank you so much for joining, Mrs. Starling-- Suzie.

Ah, another V.I.P.

Excuse me one moment.

I thought you'd retired.

(men greeting in background) So did I.

(sirens wailing in distance) Becks?

Come on.

Good girl.

(sirens continue) ♪ ♪ According to his sailing club lanyard, the victim is Kit Harcourt, 34 years old.

The club commodore, James Wyckham, is on his way now.

Thank you.

Who called it in?

They did.

Apparently birds come out to feed after a storm.

They were hoping to see a red-necked phalarope, but they got more than they bargained for.

TANIKA: Time of death?

BRENDAN: Uh, pathologist reckons somewhere between 4:00 and 6:30 a.m. Looks like the boom struck him in the back of the head.

TANIKA: So you think it's an accident?

Uh, well, I was a Sea Cadet as a boy, and risk of injury from a boom strike, drilled into you.

Never had you down as a sailor, Brendan.

Well, all I'm saying is that he must've been mad to even think about sailing this morning-- the wind was gusting 45 knots?

TANIKA: Then why did he try?

Mm.

Do we have any witnesses?

We're working on it.

TANIKA: The incident could've been seen from numerous vantage points.

Jason, can you ask the twitchers if I can borrow their binoculars, please?

JASON: Excuse me.

(continues indistinctly) Thanks.

♪ ♪ Of course they're here.

♪ ♪ ♪ ♪ ♪ ♪ (tools tapping softly) Of course, Tanika.

If I hear anything, I'll let you know.

What's going on?

Well?

There's been a death at the sailing club.

Is it murder?

Well, they're thinking accident, but keeping an open mind.

And they're looking for witnesses, so if you hear anything... May I introduce Darius Gifford, professor of early medieval archaeology at the university.

Mrs. Potts.

I know you by reputation.

Your remarkable research into the Ostia Antica excavation.

That's required reading in our ancient history department.

JUDITH: Well, that was some time ago, but thank you.

Will you be joining us today?

Sadly, no.

I just came down to review the drone footage from this morning's aerial land survey.

Oh, how exciting!

(chuckling): Yeah, well, it would've been, but the high winds made the drone impossible to control.

Ended up being blown back over the river.

Um... May I see the footage?

Yes, of course.

I'll forward the download to the site laptop.

But then, I'm afraid I must go.

I have a lecture to give.

But it really was a pleasure meeting you.

Likewise, Professor Gifford.

Oh, Darius, please.

I think she likes him.

No, maybe she just admires his academic prowess?

No, she likes him!

Thank God Michael didn't live to see this.

It's all so awful.

TANIKA: Excuse me.

JAMES: Morning.

James Wyckham, club commodore, and this is Ursula Liddington, our honorary secretary.

Hello.

ALICE: DC Hackett.

Hello.

TANIKA: DS Malik-- thank you both for coming in.

How well did you know the victim, Mr. Wyckham?

Well, outside of sailing, not very well.

He'd only been with us for just over a year.

Kit was dedicated to the club, and an extremely generous donor.

So he was well-liked?

No issues with any of the club members?

No.

No, nothing like that.

Would you agree, Mrs. Liddington?

Sorry, I, I'm not quite myself.

(softly): I think she's still in shock.

It's probably best if I answer your questions for now.

Why was Mr. Harcourt attempting to sail so early?

Well, Kit worked in the City.

He had to be at his desk when the markets opened.

And sunrise is the perfect time for a summer sail.

I often do the same myself.

And this morning?

No, it was gusting a force 9.

I'd never go out in those conditions.

Would anyone else be at the club at that time of day?

Gregg Cooper, maybe.

He's our rear commodore.

He's responsible for opening up, although he doesn't normally get in till about 8:00 a.m.

Unless he's had a few Naval Golds, and then he sometimes crashes at the club.

So, he's a drinker?

Rather over-fond of the sauce, but perfectly amiable.

Sarge, just finished securing the perimeter.

Looks like the boat store's been broken into.

♪ ♪ (sighs) This is the second time in as many months.

What's been taken?

A consignment of outboard motors.

They were delivered earlier in the week.

Is the boat store alarmed?

Yeah, the panel's in the corner.

I'm the first point of contact, but the alarm company didn't call me.

And here's why.

Professor Gifford seems like an interesting man.

Oh, yes.

And highly respected in his field.

And not bad-looking, either.

Really?

I didn't notice.

(softly): She blushed-- I knew it.

There you are, Mrs. Potts.

Primed and ready to go.

I'll leave you to it.

You're not just interested in potential burial sites, are you?

Not entirely.

Okay.

According to the time stamp, the footage starts at 5:17 a.m. (computer beeps, drone buzzing) Darius said the drone gets blown off-course over the river.

(wind gusting) There it goes.

And over the river is the sailing club.

Oh, Judith, you are clever.

♪ ♪ JUDITH: The body was found near the slipway.

Oh, there, is that it?

Can, can you zoom in?

Yeah.

♪ ♪ Now, there's the body.

Who's that?

Call me old-fashioned, but if this was an accident, why would anyone prioritize the boat over helping their mate?

The rest of the footage may answer your question.

Ooh!

See that?

A flash of yellow in the water?

Where?

JUDITH: Yes!

BECKS: There.

Looks like a bag.

And it's moving.

(computer chirps) BECKS: Huh.

That's it, I'm afraid.

That may not be our only witness.

What's that?

The Marlow Donkey timetable.

Never without it.

So, the first train leaves Maidenhead at 5:15, meaning it would pass the sailing club at roughly 5:22, around the time the person on the footage would be making their escape.

Any potential burial sites, Mrs. Potts?

Um... Undiscovered settlements?

Sadly not.

And I'm afraid we have to leave as a matter of some urgency.

As does he.

BECKS (whispering): I think she might actually be stalking me.

MRS. EDDINGHAM: We always do our big shop on Thursdays, and we're hosting the parish council supper tonight.

Mrs. Starling.

I have seen you, by the way.

Well, come on-- the fridge won't fill itself!

I'm afraid I can't, dear.

Someone has to man the fort.

We've canceled bridge twice.

We've missed the bowls tournament.

His silly little hobby is ruining our lives.

(voice breaking): And you're encouraging him!

Sorry about that.

She's used to getting her own way.

(sighs) You've got to love a strong woman.

(birds calling) Something's troubling me, Sarge.

In order to get the boat on the water in those winds, you'd never raise the sail onshore.

So why did he?

This is starting to look well dodgy.

(phone vibrating) (vibration stops) JUDITH (on phone): We're on our way over now.

There's something you need to see.

What?

JUDITH: Evidence that suggests it wasn't an accident.

It was murder.

♪ ♪ (taps) TANIKA: Looks like you're right, Judith.

And the victim suffered significant facial injuries, like he'd been in a fight.

So, whoever this is assaulted Kit Harcourt, struck him with the boom, and then left him for dead.

And then raised the sail to give the impression that the force of the wind swung the boom into the back of his head.

TANIKA: You and Brendan are turning into the dream team.

Maybe I should make you partners.

You could be Watson to my Sherlock.

Well, no, I, I was thinking more the other way round.

(softly): Mm.

There was also a break-in here the same night.

Are the incidents connected?

TANIKA: It's not straightforward.

According to the security company, the alarm was disabled at 2:09 a.m. BRENDAN: And if this footage is right, then Kit Harcourt was murdered three-and-a-half hours later.

It shouldn't take that long to shift a few motors.

(train brakes screeching) Find out what time the first train passes the club.

Uh, we already have.

(phone vibrating) 5:22.

We need to speak to everyone who was on that service.

(vibration stops) Hi, thanks for calling back.

SUZIE: My mate Jackie takes that train.

She works at Tynham's Boat Yard?

Yeah, I'll call in on my way home.

Does anyone at the club have any idea what happened?

TANIKA: Only committee members have access at that time.

JASON: Mm.

TANIKA: So far, the only people we've spoken to are club commodore James Wyckham and longtime member Ursula Liddington.

Oh, I know Ursula quite well.

She's a regular at church.

TANIKA: James Wyckham told us Kit Harcourt was well-liked, but I got the impression Mrs. Liddington didn't agree.

Uniform's at Gregg Cooper's house.

He's not there and neither is his car.

We need to find him.

Ursula Liddington's still in the clubhouse.

Maybe you'll have more luck than I did.

♪ ♪ SUZIE: Oh, I am never joining this club.

I thought sailors were supposed to be sexy.

(chuckles) Wait, or was that pirates?

Becks.

Oh, I'm so sorry, Ursula.

This must all be a terrible shock.

May I introduce Judith Potts and Suzie Harris, my fellow civilian advisers.

When something like this happens, the police draft us in to help gather information on the ground.

And your inside knowledge could be crucial to the investigation.

But I know nothing, really-- you should be talking to James.

JUDITH: He told the police that Kit Harcourt was popular here.

James likes to give everyone the benefit of the doubt.

But you're not sure he deserved it.

Kit was always charming to me, but he was ambitious.

Determined to be a key player at the club.

It's fair to say he ruffled a few feathers.

Anyone in particular?

JAMES: Ladies.

Sorry, James.

I'd completely forgotten the time.

I'm happy to wait.

No, no, it's nice of you to offer me a lift.

I'll get my coat.

(shutter clicks, camera beeps) (Brendan talking indistinctly) TANIKA: Well?

I think you might be right.

Ursula does seem a bit cagey.

She gave the impression that Kit Harcourt wasn't as popular as James Wyckham would have you believe.

TANIKA: But she didn't name any names?

No, but she's down to help with the church flowers later.

I can see if I can find out a bit more.

Sarge, the car's here.

I need to get back for the briefing.

Keep me updated.

Oh, gosh, I've got to get back, too.

Yeah, and I'll pop in and see Jackie.

See what she saw from the train.

JUDITH (stammers): We didn't mention the bag!

Oh, Brendan, one more thing.

Hit me.

There's a yellow sailing bag on the drone footage.

Becks spotted it close to the slipway before it was carried downstream to Marlow.

Hm, good spot-- mm.

If you got time to look into it, be our guest, but we're still combing the crime scene for any evidence.

Oh, then you might be interested in that tiny gold link.

Where?

Just there.

BRENDAN: Oh, yeah.

Thanks, partner.

I'm not a cowboy, DS Perry.

No.

No, you're not.

Let's forget that one.

I think that best.

Mrs. Potts.

There's an app that can track local river conditions.

According to today's data, the current should have taken that bag to the weir.

I see.

How clever!

If you want to check it out, I'm happy to take you there.

It's on my way back to the station.

Well, that would be most kind, Jason.

And I can use you as a guinea pig for my latest set of clues for "The Marlow Free Press"-- all archaeologically themed.

It would be my honor.

Thank you.

Mm.

Let's start with an easy one-- snide remarks that an archaeologist might appreciate.

Four letters.

Oh, feeling the pressure now, Mrs. Potts.

Is it "digs"?

Excellent!

Now, we'll move on to something a little trickier.

Mm.

(birds chirping) (humming) Jax!

Suzie!

You got time for a quick chat?

Always.

I'll put the kettle on.

All right?

(greeting and laughing) ♪ ♪ Morning, Toms!

(chuckles) Have you lost summat, Mrs. Potts?

Uh, not personally, but perhaps you can help.

A bag fell into the river at the sailing club, and the current should've brought it to the weir, but I can't see it.

After a summer storm, the river rises, washes everything downstream to Dagger's End.

Thank you, Tom.

You've been extremely helpful.

SUZIE: Just like old times.

JACKIE: You and me, sharing a flask of tea, while those school gate queens sip lattes at Lorenzo's.

We never quite made the cut, did we?

'Cause we didn't have a bloke.

(groans) Or the right accents.

Or any dosh.

(chuckles) Mm-hmm.

But now, our amazing girls are amazing women.

(exhales) We can be proud of that.

Yeah.

(mugs clink) And everything else we've achieved.

(chuckles) Did I tell you?

I'm coaching the youth squad at the sailing club.

What?

Yeah.

(both chuckle) So, you'd have heard about the murder, then?

Some guy called Kit Harcourt.

Kit?

When was this?

This morning.

Around about the time your train passes the sailing club.

Thought you might've seen something.

I was on the road side.

The only person I saw was Gregg Cooper, but he's often there.

They also had a break-in.

Again?

What did they take?

A load of outboard motors.

Police think it could be related.

Word is, there's an inside man at Marlow Marine.

They supply all the boat engines round here.

So, how did you find Kit?

As a person?

Sounds like he rubbed a few people up the wrong way.

(voice trembles): He did more than that to Dad.

What do you mean?

You know Dad was running the club members' bar?

Kit accused him of fiddling the accounts.

Harry?

No way.

Dad denied everything, but he was forced to resign.

Thinks Kit deliberately set him up.

(softly): Poor Harry.

He's a broken man now, Suze.

Everyone in the boat community thinks he's a criminal.

(scoffs): Business has never been so bad.

You don't think the police will think he's got something to do with this?

They might want to know where he was this morning.

He just needs an alibi to put him in the clear.

Can I talk to him?

Could be important.

You can try, but I've not heard from him since yesterday.

♪ ♪ We're investigating the murder of Kit Harcourt, a highly successful investment banker.

34 years old, single, with no criminal record.

We need to understand who might want him dead and why.

Key person of interest is this man, Gregg Cooper.

He's not at home, his car is missing, and he's not responding to calls.

ALICE: And we did find that broken bottle of Naval Gold close to the slipway, which is the brand Gregg Cooper's known to drink.

Check out his phone and bank records.

They could help us trace his movements.

Other people of interest at the sailing club are James Wyckham and Ursula Liddington.

They gave conflicting accounts of Kit Harcourt's character.

Do they both have alibis for the time of death?

ALICE: Well, James Wyckham's wife, Hayley, confirmed he was at home at the time of the murder.

Mrs. Liddington said she was in bed, but lives alone-- we only have her word for it.

We're still talking to other club members, but so far, nothing of interest.

Is Hayley Wyckham involved with the club?

BRENDAN: Oh!

Uh, yes, she's the, uh... ...house manager.

She's in charge of maintenance, staffing, and, uh, club kit.

Um, her statement backs up her husband's.

"Kit was a decent bloke."

TANIKA: The break-in was the same night as the murder.

Are the two incidents connected?

Could be a place of wrong place, wrong time.

Victim saw something, had to be silenced.

Anything else that might help us?

Oh, I, um... We found a single gold link in the grass near the body.

It's been identified as coming from a vintage wristwatch.

But no one's reported one missing.

And it looks like solid gold.

So, it's valuable.

Who does it belong to?

Gregg Cooper, or one of the thieves, or someone who's not on our radar yet?

Get the link and bottle fast-tracked for DNA.

And we need to find Gregg Cooper.

♪ ♪ (snorts) (panting) (car door closes) ♪ ♪ ♪ ♪ ♪ ♪ (sirens wailing in distance) (card reader beeps) (knock at door) ALICE: Sarge.

Thought you might want a heads-up.

About what?

I overheard Greenly on the phone to D.I.

Hoskins.

They were talking dates.

Do you think he's coming back from sick leave?

Just as I'm getting good at this.

It might not be that.

(phone vibrating) (vibration stops) If this is my last case as S.I.O., I've got to solve it.

♪ ♪ Breakthrough!

I found the bag!

(laughs) BECKS: Where?

In this little inlet.

Exactly where Young Tom said it would be.

And it has some quite interesting contents.

SUZIE: Oh, result!

And I managed to speak to Jackie.

BECKS: Ursula Liddington's waiting for me in church.

I'll report back.

Then I suggest we all regroup at the station.

(taps) (door closes) ♪ ♪ You really didn't need to come today, Ursula.

I'm afraid I did.

I'm in a terrible quandary.

BECKS: Whatever you're holding onto is making you very unhappy.

(inhales sharply) Something happened at the club last night.

Something terrible.

We'd had a committee meeting that didn't end well.

Gregg had been passed over as vice commodore, a role he expected to be his.

Everyone else had gone home, and I was missing Michael dreadfully.

Always felt closer to him looking out over the river.

And then I saw them.

(Gregg talking angrily) Gregg had been drinking more heavily than usual.

He was angry, humiliated.

Wanted to take revenge.

GREGG: You are going to leave this club and never come back, or I will not be responsible for the consequences.

(grunts, punch lands) Stop embarrassing yourself-- you're done here.

Had anything like that ever happened before?

There was an incident a few months ago.

Kit had only been learning to sail for just over a year when he won the prestigious Liddington Cup.

That was always Gregg's race-- no one could believe it.

Well, what happened?

Oh, Gregg passed out halfway round the course.

Claimed Kit had spiked his drink.

Sabotage?

Nothing was ever proved.

Kit accused Gregg of being intoxicated, and, as he was known as a great drinker, everyone believed him.

So, is that why Gregg was passed over as vice commodore?

Yes.

James believed that Gregg's recent behavior made him a liability, and he wasn't prepared to take the risk.

But do you think Gregg is capable of murder?

Last night, I saw a man I didn't recognize.

A man pushed to the edge.

So, I'm afraid I do.

BRENDAN: Sarge, uniform just found Gregg Cooper's car in Frith Woods.

Traces of blood on the interior and another empty bottle of Naval Gold.

But no phone, no wallet, and no Gregg Cooper.

Well, we've got his mobile and bank records back.

No activity since his phone was turned off at 23:38.

Where is he now?

He can't just have vanished without a trace.

If it's Gregg Cooper you're talking about, we might be able to help.

The yellow bag I mentioned?

I managed to track it down.

What yellow bag?

This one.

We spotted it on the drone footage a few feet away from the victim's body, before it was swept away.

You were all terribly busy, so I decided to try to locate it myself.

Its contents identify the owner as Gregg Cooper.

So that's why we couldn't track him.

SUZIE: Spoke to my mate Jackie.

She said she saw Gregg Cooper from the train this morning.

So, he was there?

But why would he throw a bag containing all his valuables into the river?

BECKS: To cover his tracks?

If he wanted to disappear?

SUZIE: Or it got blown into the water and he panicked.

Had to let it go and run back to the car.

I managed to get Ursula to open up.

Gregg and Kit had a fight outside the sailing club last night.

BRENDAN: Which explains Kit Harcourt's other injuries.

What were they fighting about?

Gregg accused Kit of waging a dirty-tricks campaign against him.

Said if Kit didn't leave the club, he'd come for him.

Doesn't sound like the harmless drunk James Wyckham made him out to be.

And we have evidence that places him at the scene.

Where is he now?

Well, if I wanted to disappear in Marlow, I'd hide out in one of them boats.

There's hundreds of them.

We can't search them all.

You got a better idea, Brendan?

And there's something else.

According to Jackie, Kit Harcourt falsely accused her dad, Harry Tynham, of stealing from the club members' bar.

Even produced accounts to prove it, forcing poor Harry to resign.

We need to follow that up.

Sarge.

♪ ♪ (door opens) (Harry exhales heavily) JACKIE: So you are still alive, then, Dad?

I was getting worried.

Tried calling you, loads of times.

Left me charger here.

But you heard about Kit Harcourt?

(sighs): Yeah, I saw it on the news.

You remember Suzie?

Amy and Zeta were mates at school?

Of course I do-- why?

Well, she works for the police sometimes.

Was asking if I saw anything from the train.

Did you?

Only Gregg.

Did James Wyckham get hold of you?

No, I told you, my phone was off.

It's about the keel on the Marlow Maiden.

He's querying the need to replace it.

Wyckham doesn't believe a word I say.

What should I tell him?

Well, he can come this afternoon.

Look for himself.

I'll show him the rotten keel and the paperwork.

Then he can't accuse me of trying to swindle him.

(people talking in background) VICKY: You can't keep doing this.

(speaks indistinctly) Of course I spoke to him.

♪ ♪ (clears throat) Everything all right, Tanika?

Yeah, fine.

This is everything we've got on the thefts, plus forensics and photographs from the murder scene.

JUDITH: Anything from the search at Kit Harcourt's house?

Nothing apart from a large cleaning bill.

Police boots and luxury flooring aren't the best of friends.

Well, there's always something.

If you can work out what it is, I'd be grateful.

(ducks quacking) So that's it, then.

We're out at the end of the month.

Landlord's refusing to give us any more time.

All that land, nothing we can do with it.

(scoffs): We can't give up yet, Mum.

(phone buttons clicking) Heard anything?

No, me, neither.

Just need to keep our heads down.

Got to go.

JUDITH (voiceover): I wonder if there's a link between the theft and the murder.

What exactly are you looking at?

I'm not quite sure yet.

I need to go back to the sailing club, try to make sense of it.

(door opens in hall) (gasps softly) VICKY: DS Malik?

♪ ♪ (speaking indistinctly) ♪ ♪ (chuckles weakly) Just needed a few minutes to think about the case.

Carry on.

Is it just me, or was that really weird?

It was certainly unorthodox.

It's time for Cecil's walk.

I'm going to go back along the river and check those boats for any signs of Gregg Cooper.

Kit Harcourt's house is en route to the club.

I may just pop in on my way.

See if the police missed anything.

How are you going to do that without a warrant?

Well, I'll worry about that when I get there.

♪ ♪ ♪ ♪ (Cecil snuffling) (barks softly) Relax, mate.

There's no way they'd want to take you.

No offense.

♪ ♪ (birds chirping) ♪ ♪ Afternoon.

♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ There's always something.

(Cecil barks) SUZIE: Come on!

(people talking in background) LYNNE: Hey, Suzie!

Hey.

Coffee?

(laughs): Oh, yeah, make it a large one.

It's been a long day.

(chuckles) LYNNE: Terrible, isn't it?

One of our regulars had his whippet snatched out his garden.

It's getting like the Wild West around here, innit?

Did you hear about the murder at the sailing club?

No.

Yeah, that's partly why I came in.

Who was killed?

Some young bloke.

Kit Harcourt?

They thought it was an accident.

Drone footage proves it wasn't.

When was this?

Between 5:00 and 6:30 this morning.

Police are looking for witnesses.

I'll ask around.

♪ ♪ (sighs) Coffee, Dad?

No, thanks.

I'm going out.

But we've got the meeting at the bank, remember?

I'll be there.

♪ ♪ ♪ ♪ (speaking indistinctly) Ah, Mrs. Potts!

You've got another crossword clue for me?

Not this time, Jason, but I was hoping you'd be here.

There's something I need to borrow.

♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ Thank you.

Um, Judith Potts.

I work with the police in a civilian capacity-- are you a member here?

Yes-- Hayley Wyckham, James's wife and house manager.

Can I ask what this is about?

I need someone who might be able to tell me what Kit Harcourt was doing with this committee photo from 2003.

Kit came to the house.

Said he needed photographs of members' younger selves for a fundraising event at the club.

It was the only thing I could find.

But the event never happened.

I suspect he obtained it under false pretenses.

Why would he do that?

I'm afraid I have no idea, but it wouldn't be the first time he manipulated the truth to get what he wanted.

You didn't like him much, did you?

That's not what I said.

Can I ask where you were between 5:00 and 6:00 this morning?

At home, in bed.

James always brings me tea around that time.

So, if you're asking if I had anything to do with what happened, the answer is no.

♪ ♪ BECKS: Anyone for a top-up?

SUZIE: Please.

JUDITH: Hayley Wyckham claims that Kit Harcourt was dangerously manipulative.

He'd made enemies of Gregg Cooper and Harry Tynham, giving them both motive.

BECKS: Which backs up Ursula Liddington's statement.

Both lines of inquiry are being followed up by the police.

But there was something I couldn't get out of my head.

The possibility that the theft and the murder were connected somehow.

These are copies of photographs taken by forensic officers.

I was curious about this oil spill and the smaller patches leading towards the door.

Had our thief stepped in oil while stealing one of the motors?

And then I remembered reading that engine oil is now injected with dye to facilitate detection of leaks under ultraviolet light.

So, I borrowed Jason's U.V.

torch.

Nice one.

Under U.V.

light, the residue on the thief's shoes shows up as a trail, as illustrated here.

So, as you can see, someone walked from the boat store to the area where Kit Harcourt's body was found.

The trail ends there.

But it confirms the connection between the theft and the murder.

That's brilliant.

I think we can work out what that connection might be.

(door opens) TANIKA: Hello?

There's been a development.

Someone spotted Gregg Cooper from the river walking down the Thames Path at Bourne End.

Our officers haven't located him yet, but we're getting closer.

He'll be hiding out on a boat-- I keep telling you.

You might be right.

We're looking into it.

But there's something else.

Alice managed to catch Harry Tynham at the boatyard.

He denies any involvement, but has no alibi for last night.

Harry is a lovely, kind bloke.

And he's been a brilliant dad to Jackie ever since her mum died.

Nah, he wouldn't hurt anyone.

But we've got to face facts.

Kit accused him of stealing money.

It destroyed his reputation.

Harry's got a clear motive.

And there is just one more thing.

I need to apologize for earlier.

I was hiding from DCI Greenly.

D.I.

Hoskins is coming back.

Once Greenly informs me of that officially, I'll be off the case.

(groans softly) I need you to help me solve it before that happens.

We might be closer than you think.

♪ ♪ So, what exactly are we doing?

Well, the engines were bought here, but stolen after they'd been delivered.

We need to find out how that could link to the murder.

I'll take the sales office-- set the plan in motion.

BECKS: What do we do?

Go to the loading bay.

Spread the word that I'm placing an extremely valuable order.

You're masterminding some sort of trap, ain't you?

I may very well be, but that's strictly off the record.

♪ ♪ Hello.

Um, I'd like to order a top-of-the-range outboard motor.

Money no object.

All right, uh, what's the spec?

I, I'm not exactly sure.

Okay, uh, what model boat have you got?

Um...

Uh-- oh, well, well, it's a bit like that one.

Only it's blue, not red.

♪ ♪ (softly): Looks like he's in charge.

(speaking indistinctly) (softly): Keep watch and I'll check it out.

Yeah.

♪ ♪ Suzie?

Hm?

Did you hear me?

Yeah, of course.

♪ ♪ (door opens) (door closes) ♪ ♪ ♪ ♪ Jackie?

It's James.

(radio playing softly) Harry?

(switch clicks, radio stops) ♪ ♪ The Aurora 214 is our top-of-the-range motor, but it's pricey.

Stop worrying about money, Kevin.

I don't.

I just want the best outboard motor you have.

In fact, I'll take two.

Then I'll have a backup.

(wallet unzips) ♪ ♪ (door closes) (shutter clicks) Oh, may I... Can I help you?

Hello, Des.

My friend is spending a small fortune in the sales office, so I decided to go for a wander.

So, uh, what's she buying, this friend?

Outboard motors.

Yeah, the ones she has are kaput.

She cannot bear a day without sailing.

So, it's a bit of an emergency purchase.

Do you do next-day delivery?

Yeah, for big orders.

Is she local, this friend?

Oh, yes.

Massive house on the river.

A bit too lonely for me.

Do you like a bit of company, do you?

(voice trembles): Um... Oh, look, there's my other friend, she's, she's, uh, been for a wander, too-- got to go!

(whispering): You were supposed to be keeping watch!

Where were you?

Well, I, I thought Gregg Cooper might be in one of them boats.

Well, next time, I'll be lookout.

(softly): Come on.

♪ ♪ (grunts) Stage one of Operation Colosseum is complete.

Colosseum?

What's that about?

All will become clear tomorrow-- how did you get on?

I told the warehouse manager you were placing a big order for urgent delivery and you live in an isolated spot.

Excellent.

Everything is perfectly in place for my plan.

♪ ♪ (door opens and closes) Uh, Harry!

(grunts): I was just checking the keel to save time-- the door was open.

Hope you don't mind.

(wood creaking, breaking, James gasps) (wood crunching, James screaming) ♪ ♪ (click) ♪ ♪ Call an ambulance!

(groans) Dad's not capable of hurting anyone!

TANIKA: We can't ignore the evidence.

Bring him in.

There's something really off here.

GREGG: He deserved everything he got!

I know who it is.

BECKS: Are you sure about this, Judith?

Someone could get hurt.

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