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Charlie Isaacs and his family arrive in Los Alamos and attempt to navigate a community built on secrets. Frank Winter, the head of the Manhattan Project, struggles with the sacrifices he is making to help the U.S. win World War II.

Frank's attempt to save his team brings serious consequences. The scientists' wives find creative ways to survive life on The Hill.

The community reels after losing a member, while new security measures affect the scientists' work.

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

When Babbit's past comes back to haunt him, Frank clashes with Charlie to protect his mentor.

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

Charlie and Frank both face serious questions about the future of their projects.

Helen and Charlie must solve a crisis at the reactor. Frank and Liza help Paloma's family. Abby begins a journey of self-discovery.

Charlie and Frank are forced to work together for the good of the project. When they run into a problem, Frank turns to an unconventional resource.

Wives explore their inner desires. Visit from dead "spy's" spouse. Winter explores an unusual solution to ignition problem.

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 is given a life-changing opportunity, while Charlie finds himself in the US Army's hotseat.

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

The countdown to the first nuclear weapon test goes on, as Frank Winter races to apprehend a Soviet spy who intends to sabotage the gadget. The scientists from the hill withdraw from the Trinity site to witness history being made.

Frank discovers the real reason he's been taken captive.

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

Frank's situation improves with unexpected aid. Oppenheimer's private life has unforeseen impact on project.

Frank tries to navigate his new place on The Hill.

The hunt for a Soviet spy turns deadly.

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

As the project falters, Charlie turns to an unlikely partner for help.

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