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.
A Compassionate Spy, A Compassionate Sp, El espía y la bomba atómica, Förrädaren som ville rädda världen, Szpieg, który współczuł, Um espião compassivo, Um Espião Compassivo, Милосърдният шпионин, 间谍本多情