Bill gets drawn into a horrifying crime that hits close to home. Holden receives an intriguing offer while in Atlanta to interview a pair of killers.

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

Frank seeks medical answers; Charlie and Helen travel to survey an off-site reactor.

Helen and Charlie deal with a crisis; Abby embarks on a journey of self-discovery.

The hunt for a Soviet spy turns deadly.

Days before the world’s first nuclear explosion, everyone races to secure their place in history.

Oppenheimer puts Charlie in a precarious position.

Dembe’s position as an FBI agent causes complications for Red as the Task Force handles a case involving military technology. Cooper and Park each find their personal lives increasingly complicated.