Physicist Ted Hall is recruited to join the Manhattan Project as a teenager and goes to Los Alamos with no idea what he'll be working on. When he learns the true nature of the weapon being designed, he fears the post-war risk of a nuclear holocaust and begins to pass significant information to the Soviet Union.
Theodore "Ted" Hall was an American physicist and an atomic spy who passed along detailed information about the implosion-type "Fat Man" bomb and several processes for purifying plutonium to the Soviet Union.