Manhattan

Charlie finds himself forced into a new leadership role in the race to build the world's first atomic bomb, while Frank is torn between his duty to the project and his own moral compass.

Frank finally learns why he's been taken captive. Meanwhile, Charlie is still reeling from his affair and Liza longs for something more in her life.

Tensions between the scientists and their military handlers reach a boiling point. Liza faces off against Darrow as Abby learns a secret about Oppenheimer.

As the scientists grapple with the moral implications of creating such a destructive weapon, they receive an unexpected visitor. Oppenheimer's private life has unforeseen impact on the project.

Frank grapples with his demons, while Liza confides in Abby. The scientists get one step closer to building a workable atomic bomb.

As the scientists and the Army battle for control of the bomb, Frank struggles to keep his team focused and on task.

The hunt for a Soviet spy turns deadly. Meanwhile, Colonel Emmett Darrow is put in charge of overseeing the final preparations and Charlie receives shocking news.

Frank finds himself at the centre of attention as the safety of his team's work comes into question. As the project falters, Charlie turns to an unlikely partner for help.

With just a few days to go before the world's first nuclear explosion, tensions within the project boil over. Abby is haunted by flashbacks of her past.

The team withdraws from the site as the countdown to the nuclear test begins, while Frank races to apprehend a Soviet spy who intends to sabotage the gadget.