Cloak and Dagger is a 1946 American spy film directed by Fritz Lang which stars Gary Cooper as an American scientist sent by the Office of Strategic Services (OSS) to contact European scientists working on the German nuclear weapons program and Lilli Palmer as a member of the Italian resistance movement who shelters and guides him. The story was drawn from the 1946 non-fiction book Cloak and Dagger: The Secret Story of O.S.S. by Corey Ford and Alastair MacBain, while a former OSS agent E. Michael Burke acted as technical advisor. Like 13 Rue Madeleine (1947), the film was intended as a tribute to Office of Strategic Services (OSS) operations in German-occupied Europe during World War II.