Charlie Isaacs (Ashley Zukerman) leaves home and finds a stick-figure drawing from his son on the windshield.
Charlie seems doubtful that Emperor Hirohito will surrender to a warning shot.
Its not a warning shot.

Credit: Greg Peters
Its not even another bomb, Winter says.
Its a second sun.
The emperor is not surrendering to an army; hes surrendering to the power of the universe.
Winter urges him to wait and seize the last word and attempt to make it personal.
Isaacs takes out the drawing, which has a note written on it: GOOD LUCK DADDY.
Winter thinks that will be persuasive.
Just verify you get the last word.
The U.S. has determined this is code, but for what?
They have no idea how long Green will hold back what he knows.
When his interrogators bring up his daughter, Eleanor (similar name, right?
Crosley doesnt buy it.
NEXT: What really happened to Jean?
Jean committed suicide sometime after Abby telephoned her to anonymously chastise her for the illicit relationship.
She feels responsible for the womans death and has reached out to her family to make amends.
But…Jeans father doesnt believe the suicide note was written by his daughter.
Abby confronts Oppenheimer (Daniel London) with the information.
What business is it of yours?
Do you know the difference between a conjecture and a theorem?
I may conjecture that Col. Darrow had Jean murdered to keep me on the project.
But I have nothing to test, to prove.
He tells her she doesnt need to return to the switchboard.
Im telling you theres a job to be done.
Now, we hear him straight-up advocating for it.
Youre a soldier, right?
The extent of the fallout will depend on the weather, she says.
She bought them at the P/X and has no idea.
Ive had enough death for a lifetime, Fritz tells Isaacs.
In the detention area, Darrow comes storming out of the cell containing Green.
Clean it up, he says, looking urgent and disheveled.
Inside the room, Green is lying dead.
It doesnt seem he got the information he was looking for.
Your men, from St. Louis.
Your fathers men who took care of Jean Tatlock.
Have them do it.
It was a bluff, Charlie says.
To light a fire under Darrow.
He took things too far.
He did it, not me.
You think a jury cares whose hands are dirtier?
You let me believe I was responsible for a womans death, she answers.
Charlie has no time for this and asks to see his son.
Hes on his way to Brooklyn, Abby says revealing the second reason behind this episodes title.
She has sent him to her parents house with their housekeeper.
Colonel may have me trapped here, but my son will have no part of this, she says.
Charlie grabs her violently.
You think I wont get in the car and bring him back?
Your test is in 24 hours, she replies coolly.
You think I dont know which way youll drive?
Back in Greens barn, Bucher and Crosley are staging the deceased spys hanging suicide.
Bucher casually mentions that he prefers to create these scenes in peoples homes.
Its a good place to open a wrist or drown, he says.
You know what that implies.
Neither believes Green confessed the identity of Brooklyn.
Angry man, your colonel, Bucher says.
Hell make a hell of a senator some day.
Each grabs a foot and pulls cracking the neck of Greens corpse.
World War II is over, Bucher says.
The next war has already started.
Its going to be unlike any conflict in history.
Its going to be waged silently by men like you and me.
Were forming a new breed of intelligence operation.
One with a more…centralizedapproach.
You want to kill my friends, Meeks says.
We do one terrible thing tomorrow, she says.
But then no one ever has to again.
He tells her not to go, and she gripes that even he has a pass to attend.
Hes got to be Perseus, the other Soviet spy right?
At the very least, the show clearly wants us to think this.
I hear you fixed both gadgets inside of six months.
Not bad for a conscientious objector, Bucher says.
What do you want?
I thought you might like to know, Bucher says.
The next day, Helen confronts Frank in his office.
She has found out how the metallurgy budget ended up in Rochester.
Frank filled out the wrong forms.
Quite a coincidence, Helen notes.
It must be really exhausting making sure we dont finish Little Boy on time, she says.
She has backed every move by Frank, even the illegal ones.
When the Target Committee meets, Charlie doesnt wait for the last word he starts the meeting, instead.
Isaacs says we need to show the world unmitigated power.
The truth is, we can be loved or we can have peace, he says.
You mean a military target, one of the generals interrupts.
No, a city.
Full of civilians, Isaacs says.
And we detonate at the altitude that gives us the widest blast radius.
Maximum destruction of infrastructure.
It has to be catastrophic, on a scale that no one has ever imagined.
He thinks for a moment.
If we detonate our bomb on a desert island, we might stop this war.
But we wont prevent the next one.
The weapon were testing Fat Man.
Well measure it in kilotons for TNT.
But 20 years from now theyll be counting in megatons.
At the same time, we see Jim and Stan (aha, he is Perseus!)
driving together to the test site.
Suddenly, they seem like the good guys.
After the Target Meeting, Charlie paces around the desert, looking distraught.
Oppenheimer walks up to him, and without breaking stride, he punches Isaacs in the face.
But also, Oppenheimer seems horrified at what Charlie has just proposed.