Murder in the First

He's killed 18 kids,

and now he's killed one of us.

Hey. Homicide. Where's the chalk?

I just do lights.

- Hildy. - Hey.

Hey. Is Louise with Mike?

Uh, no, I, uh...

I left her with my friend Caroline.

10-4. Responding.

Where's the body?

It's buried in the old Triad tunnels.

It's chaos down there... no sense of direction.

Is it Terry?

No. No, it's uh...

it's Walt.

Do we have a current sighting on Alfie Rentman?

- Negative. - Copy that.

Hey.

You good?

Oh. It's the Chief.

Yes, sir?

Of course. Of course.

Yes, sir.

I understand, sir.

All right.

What did he say?

Uh...

With Koto down,

I'll be acting as Lieutenant, Senior Inspector.

Congrats, Boss. So now what?

Now we deal with this.

Uh, I'm gonna need you to hold some prelim interviews...

everybody that was within range of Officer Martin.

All right.

I was in Tunnel 42 when I heard a single shot.

I ran towards the sound of gunfire.

By the time I got here, Walt...

Officer Martin was dead.

Thanks, man.

- This was taken four minutes ago. - Mm-hmm.

Look at the time stamp.

Patrol lifted this off a surveillance cam

right off of the Embarcadero.

He knows we're down here... the entire SFPD.

He had the perfect opportunity to escape,

so why would he go back down into these tunnels?

14 exits.

- This is the full perimeter? - Yeah. Airtight.

And I'm counting manhole covers,

flood gates, pedestrian gates,

Triad smuggling routes, earthquake cracks.

We've got units on 12,

but two we can't access from the street level.

We got to get TAC from down here.

Exit "A" is right here. It requires muscle.

On it. Let's roll.

Other one's right here... Exit "B."

You got to get a crazy crawler in that earthquake crack,

I suggest you use her.

She's the best damn tunnel rat we've got.

All right. Be safe.

Has anyone called Walt's family yet?

He has a wife, right?

Cicily.

I'll do it.

What's that smell?

It's hydrogen sulfide.

Take a deep enough breath,

your eyes will bug out, your lungs will collapse,

and you will shit yourself.

Four-Henry Seven. Exit "A" clear.

This door hasn't been opened

since World War II.

You guys are a bunch of pussies.

Exit "B" clear.

If he came this way, he's dead.

Copy that. Perimeter is secure.

Slice and sweep.

- We've got it, Lieutenant. - Well, do you mind if I help?

Of course not.

All right, I'll catch up.

Uh, go, uh, with Officer West.

Ugh. Son of a bitch.

- Tell me. - I wish I had better news.

The kid's gone.

We covered every inch. Twice.

Either he slithered out...

Or he never was down there in the first place.

That's what I'm thinking.

All right.

Damn it.

- Does anybody hear music? - Copy that.

All right, meet me at the Triad switchbacks.

Approaching rendezvous.

Copy. Approaching.

After you.

So, where did you learn tunnels?

- Gaza. - Oh.

I didn't know they had tunnels in Palestine.

Israel.

Mazel tov.

It's here.

The music's coming from the other side of this wall.

We need to breach this wall.

You do you, Junior.

It wasn't a question.

Clear.

We found Rentman's tree house, uh,

a bunker under, uh...

Who knows?

I do.

Of course you do.

Folsom and Third,

a couple blocks away from 850.

Hey, Lieutenant.

Nobody comes back through here, got it?

Got it.

"Life on my level is beautiful. But what's the point?"

Good goddamn question.

And what's with the apples?

And the music?

- It's a riddle. - He's inviting us to play.

Play? This kid is lethal.

He could be anywhere. Why are we standing here?

No, he's close. He's not running.

He's leaving bread crumbs. He's making moves.

Those moves don't make any sense.

Yeah, well, that's 'cause we don't know him... yet.

Molk, get C.S.I. down here, tell them to bag everything.

This kid wants to play. Well, we're gonna play.

902, regroup at 850.

We're gonna learn everything there is to know about this kid.

Everything!

Hell of a first day as Lieutenant.

Is this what you dreamed of

when you first put on blue?

Dream? I just wanted a job.

I'm about to step out of this elevator

into 100 people that are looking to me for answers.

I'm right behind you.

No, I don't want you behind me.

I need you by my side.

Hey, Lieutenant.

We got a call from Dr. Rentman.

Said that Alfie may have stopped by the house.

That's impossible. We... we had that covered.

Well, we have the whole city covered,

but this kid's slippery, and, uh, there's a chance,

- so I'm gonna stop by there. - Okay.

There's no way his son wouldn't have been spotted.

Just add that to the list of leads we have

that don't make sense.

Inspectors, we had a copycat shooting in St. Louis.

Some 12-year-old shot out the windows of his school bus.

The driver tackled him before he could kill anyone.

- Jesus. - You got an age on ours?

- The shooter? Which one? - The one in custody.

He's 17, 18.

Is it 17 or is it 18?

I don't know, Mario. There's a file somewhere.

- Is it possible I could see it? - This second?

The Mayor appointed me Interim District Attorney.

I just figured I should stay somewhat informed.

- She'll get the file to you, Siletti. - Thank you.

- You'll bring it up? - Mm-hmm.

Jesus.

Alfie Rentman's computer is a digital fortress.

He's using a 256-bit A.E.S. encryption

and leveraging the hybrid

cryptographic optimizer algorithms.

Kid's a homicidal Edward Snowden.

There's one back door I'm still working my way into.

We're trying a few different side-channel attacks

to find the decryption key.

It could be a gold mine. I'm on it.

You're always on it, Kami.

She finally noticed.

Check this out.

This is a screenshot from a muni security camera.

It was taken 12 hours ago,

so I doubt it will help you locate him.

Look... his ear is jacked up. Yeah.

- Ow. That's got to hurt. - Is that where you shot him?

I don't know, but take this to Burnside.

See how long somebody can last on the streets

looking like that.

If he needs medical attention,

that'll help us war-game his next steps.

Brass waiting for you, Lieutenant.

- All right. - Go.

I'll do the rounds, keep us on the rails.

Well, just find the rails. Good work.

Hey, in your office.

Chief.

Uh, what can I do for you?

Make it official. I brought your reassignment papers.

Then you can get back to finding that lunatic kid.

Yes, sir.

"Lieutenant."

Any word on Koto?