Watson

Previously on Watson...

The Crofts aren't responding to the antivirals.

Dr. Croft?

They're positive for the herpes virus,

but it's antiviral and steroid resistant?

And it happened to both of them.

That doesn't look like something

that occurs in nature. Someone made this virus.

All that DNA you're keeping downstairs,

Moriarty knows how

to turn it against people.

I believe Adam's the target here.

Are you James Moriarty?

Pour the contents of these packets

into each culture dish.

You want me to sabotage Watson's research.

What's going on? It's dead.

There's only enough

for one dose.

We can save Stephens

or we can save Adam,

but we can't save both.

A database of human mutations.

Sounds incredible.

Thank you for what you're doing.

I'm a big fan.

There are moments when we all have to make a choice.

We have treatment to save one life:

Stephens' or Adam's.

You're talking about identical twins in their 30s.

They share the same DNA.

Stephens and Adam are

effectively the same person.

Not really.

Adam practices functional medicine.

Stephens is an infectious disease specialist.

Adam is an addict who just had a relapse... Stop.

None of this means that we can just pick.

Sometimes the ethics are impossible.

Sometimes there's no way to find daylight

between two human beings.

This... came from Sherlock.

Fate has to decide here.

Hopefully, Sherlock's wisdom guides it.

Are you awake?

My brother?

Good to see you.

Where's-where's Stephens? Is he okay?

This is wrong.

You should have picked Stephens.

I can't help you figure this out.

My brother could.

Stephens doesn't deserve this.

Do you?

So, what now?

Now we just wait and watch my brother die?

We have time.

Two days, maybe three.

There's lesions growing in his brain.

If we operate on Stephens two days from now,

what's gonna be left of him when he wakes up?

- I don't know where you are, - I don't even...

know if you'll be able to hear this, but...

my guess is that you're off somewhere punishing yourself.

And if you are, you got to freeze that,

because if the odds hold,

we'll all have time for guilt.

So if you think that you can help, we need you.

Stephens needs you.

John.

You all right, Shinwell?

You look sick.

I got your message.

There may be a play, guv.

If you're truly willing to work with me...

...I may be able to help.

Your daughter's dying.

You don't know that.

I know she ain't been discharged.

I know you ain't slept in days.

You know what, my love?

Them dark circles,

they make you look positively human.

What do you want?

Dr. Watson extends an invitation to you and your daughter.

He wants to have her into the clinic,

see what can be done for the lass. I'm not one to fall

for snake oil, Shinwell. Yeah, well, that's good,

because we don't sell fake cures.

John Watson might be able to help her, he might not,

but he's the best medic in this or any other hospital.

If you don't at least hear what the man has to say,

have you really done everything you can?

I know you.

You're the pharmaceutical rep that used to sit over there.

Yes.

And you had no idea.

Welcome to the Holmes Clinic, Ashleigh.

I'm excited to work with you.

What is this?

What do you think it is?

We're taking on a new patient. My daughter is nine years old.

She's been through more pain and disappointment

than you or me or anyone I've ever met.

I haven't been able to protect her from that,

but I can protect her from false hope.

I don't traffic in false hope.

What do you want from me?

I don't want anything.

Not yet. I don't believe you.

My name is Dr. Morstan.

You can call me Mary if you want.

Have you ever had a doctor who had his own robot?

A robot? Mm-hmm. We have one here.

His name is Clyde, and he helps Dr. Watson do his job.

Is it okay if I show you?

Okay.

Does he ever take a break?

He's never asked for one.

He does look a little tired.

Medulloblastoma, subtype SHH.

This girl had a brain tumor by her ninth birthday.

That's just not right. We should get a rush from the labs.

How's this meant to work, Shinwell?

You take Ashleigh into your care,

tell us the same thing we've heard from a dozen medics,

and I just share everything about him?

We don't need everything.

Just one thing.

That's Stephens Croft.

It's not Adam Croft.

It's not the one you targeted.

He just happens to share the same DNA as his brother.

Somewhere not far from here,

there's a laboratory where Moriarty's busy at work

on his perversions.

The vector to deliver the cure,

far as I understand it, is called

"adeno-associated virus."

If you're cooking up a bioweapon,

any scientist would have

some small amount of the cure on hand, too.

That's what we need.

Enough of that virus to save Stephens Croft.

Oh, that's all?

It's suicide to cross Moriarty.

A nine-year-old with brain cancer.

Those words don't belong together in one sentence.

You're not wrong, but it could actually be worse.

There's a treatment. Neurosurgery.

Chemo placed directly into the brain.

I didn't say it was good. I said it could be worse.

With chemo, there's a 90% survival rate for this patient.

Our immediate problem isn't the tumor.

If we can get her into surgery,

Ashleigh has a good prognosis.

The problem is her weight.

The chemo that she needs is weight-based.

If she can't get heavy enough, then her doctors

can't use enough chemo for the treatment to be effective.

If we could put 15 pounds on Ashleigh Burke,

we can save her life.

And if we can't?

She has good doctors.

Obviously, they can see the same thing we can.

Okay, so what are they missing?

Come on. I mean, a single insight

could make a big difference.

No one can figure out why she can't gain weight.

So, where do we start?

I don't think Ingrid's talking about the medicine.

We want this girl's mother to steal what we need

to save Stephens.

If she won't do that, if she can't do that...

If there's nothing

we can do to help,

do we sell her mother on a treatment

even if it's not gonna work?

Could you do that?

We're not dealing with the leader of a Brownie troop.

Ashleigh's mother is the reason

Stephens got sick in the first place.

But if we say that we're Ashleigh's doctors,

then that is who we are.

If the words don't mean something to you now,

then they've never meant anything to you

in the first place.

So again, where do we start?

Uh...

Watson?

Can I help you with something?

I'm looking for a Dr. Watson.

I'm John Watson.

My name is Laila Bynum.

I'm Ashleigh Burke's oncologist.

What is this place?

We are lucky with our funding here.

MRIs, genetic testing.

We can do a full workup and keep digging.

Ashleigh might not have time to wait