Dangerously They Live

Dangerously They Live is a 1941 American World War II spy film directed by Robert Florey, and starring John Garfield, Nancy Coleman and Raymond Massey. Nazi spies try to pry information out of a British agent.

Mike manages to get away, but this only confirms Ingersolls suspicion that Jane is faking her amnesia. By the time Mike returns with Sheriff Dill, the mansion is deserted except for Ingersoll. Still trusting his old teacher, Mike accompanies him to the district attorney. Ingersoll, however, has him committed as a doctor who became too close to the psychotics he was studying. A guard offers to let Mike escape for 500, but turns out to be working for the spies Mike ends up back in Ingersolls hands.By threatening Mike, Ingersoll gets Jane to give him the location of a large convoy, which he passes along to a Uboat wolfpack. Mike manages to wrestle a gun away from a henchman. Jane after informing Ingersoll she gave him the wrong information notifies the authorities, who send bombers which sink the Uboats. ........

Source: Wikipedia