It is 1943. New York City private detective Jack Ryder gets an urgent request from the FBI. Ryder is supposed to kill a dangerous Nazi. He also must help a client who fell in love with a woman he saw on a train platform. The client doesn't know her name but has a clue in the jacket she was wearing. Ryder aids an emotionally damaged veteran, but the two of them are in love with the waitress Ruth. Only one of them can win her heart.