In 2003, twenty years after the murder of Mary Fisher, Internal Affairs Officer Sgt. Ian Lynch is assigned to investigate Eric’s claim of official misconduct against Russell, now a Lieutenant….

In 2003, twenty years after the murder of Mary Fisher, Internal Affairs Officer Sgt. Ian Lynch is assigned to investigate Eric’s claim of official misconduct against Russell, now a Lieutenant….

In the weeks leading up to Mary Fisher’s murder, Eric meets Det. Russell for the first time to press charges against Kim Decker, a former girlfriend. Russell suspects the truth…

In the weeks leading up to Mary Fisher’s murder, Eric meets Det. Russell for the first time to press charges against Kim Decker, a former girlfriend. Russell suspects the truth…

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.

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

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

Both Charlie and Frank face serious questions as to the future of their projects.

Frank attempts to navigate his new place on the Hill.

The scientists and the Army battle for control of the bomb.

Charlie is forced into a new leadership role in the race to build the world’s first atomic bomb.

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