Frank attempts to save his team, and pays the price; at the same time, the wives get creative trying to make life on the Hill more interesting.

The loss of one of their own leaves the community reeling; and new security measures interfere with the work being performed by the scientists.

The arrival of a high-profile guest shakes things up. Frank is haunted by his past.

Frank clashes with Charlie to protect Babbit, who has become the subject of an investigation.

Frank and Charlie hatch a plan.

A development overseas re-invigorates the hunt for a spy on The Hill. Charlie and Abby make a sacrifice when the plan with Frank is threatened.

Akley becomes vulnerable when he tries to fix Thin Man's shortcomings.

Liza faces off against Darrow as Abby learns a secret about Oppenheimer.