Manhattan

In Los Alamos, New Mexico, during World War II, secrets dominate every facet of family and professional life as scientists Frank Winter and Charlie Isaacs compete to create the world's first atomic bomb.

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 one of its members, while new security measures affect the scientists' work.

A high-profile guest shakes things up on The Hill; Frank is haunted by his past; Frank clashes with Charlie to protect his mentor.

When Babbitt becomes the subject of an investigation, Frank clashes with Charlie to protect his mentor.

Frank seeks answers about a medical issue; Charlie and Helen take a trip to survey an off-site reactor.

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

Both Charlie and Frank withstand significant questions regarding the future of each of their projects.

Charlie and Frank must work together for the good of the project; Frank turns to an unconventional resource for help.

An unexpected visitor arrives on The Hill; Winter explores an unusual solution to the problem with the ignition.

A development overseas invigorates the hunt for a spy on The Hill; Charlie and Abby make a sacrifice.

Ackley opens himself up to vulnerability when he tries to fix the shortcomings that Thin Man possesses.

Frank is given an opportunity that could change his life; Charlie finds himself in the U.S. Army's hot seat.