Is the bomb test a dud or did it go just as planned?

A man shows up with a post-office box written on a matchbook.

Hes looking for someone.

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Credit: Greg Peters

Someone I care about, he says.

An agent confronts him at a gas station.

Isaacs, the man says.

Brad Garrett plays him with a kind of blustery charm.

Hes hard not to like.

At least at first.

One problem: It doesnt blow up in front of him.

Instead, it fizzes and flames out.

Its a desperate, sad sight and the clock is ticking.

Their schedule is off.

This needs to work.

Only we and the two people responsible know the truth.

Fritz is guilt-stricken and wants to volunteer to be tested on with radioactive material.

Meeks isnt self-destructive, but guilt is gnawing at him, too.

They were going to have kids, he tells Nora later.

Perseus is immature, distrustful of authority, politically unformed.

He believes he is more intelligent than he is, which makes him susceptible to flattery.

She tells him, Those notes are not about you.

Theres another Soviet spy on the Hill.

Winter calls his bluff go ahead, send him off to the front lines for insubordination.

NEXT: Hitler just blew his goddamn brains out!

Hitler just blew his goddamn brains out!

Suddenly, the quest to beat the Nazi bomb is not much of a motivator.

As they make their escape, the feds swarm their car.

Both Crosley and Hogarth are taken into custody.

But Darrow isnt buying it.

Remember when he was so unperturbed after Abby reported that Crosley was likely passing secrets via phone?

He has known about this for a long time, and Crosley was not Hogarths accomplice he was Darrows.

On the back was a date that meant it couldnt possibly be his child.

Hogarths manipulations havent been nearly as effective as he thought, and now hes finally out of moves.

For his trouble, Crosley gets U.S. citizenship.

While piecing through the remains of his failed test, Charlie gets a call.

He wants to see his grandson.

Maybe just hear his name.

Go to hell, Charlie says.

His wife, Abby (Rachel Brosnahan) doesnt have the same hard feelings.

She seeks a pass from Darrow to meet with her estranged father-in-law and bring him his grandson.

Darrow agrees after she plays on his sense of family responsibility and religion.

The Jewish people dont just need Palestine, she says.

We need each other.

Darrow grants her leave, and Abby spends an afternoon with the old timer.

He charms her, and everything seems to be going great until he reveals his true motivation.

Before saying goodbye, Abby gives Mr. Isaacs a check.

Heres where the good-time charmer departs and the snarling crook emerges.

I bet your familys been paying people off for generations, he says.

You think you know the man youre married to?

Think about that the next time youre sitting across from your husband at the dinner table.

If I was you, I wouldnt believe anything he says!

He bellows these final words as her car swerves around him on its way back to the Hill.

NEXT: How did Charlie miss it?

Yellow to red, Im not colorblind, Charlie says.

It was turned around!

What if someone made a mistake on the detonators and mislabeled the positive and negative connectors?

Before offering this solution, Frank gets Charlies commitment that he will serve on the target committee.

Frank tells him about the mislabeled detonators.

Its a solution so simple, Charlie can barely believe he missed it.

You did the right thing, Charlie says.

I know you will, too, Frank answers.

How long did it take him to figure it out?

I had to feed him the answer.

On a shelf nearby are the same kind of detonators Lazar deliberately mislabeled.