The Thief

Ray Milland plays Dr. Allan Fields, a nuclear physicist who works for the Atomic Energy Commission in Washington, D.C. But Fields is also a spy working for an unnamed foreign power. The latest canister of microfilm which Fields sends out is intercepted by authorities after a courier is killed in a freak traffic accident in Manhattan, with the undeveloped microfilm canister in his hand. The FBI develops the microfilm, analyzes its contents and constructs a list of probable suspects within the AEC, one of whom is the "custodian"