Cloak and Dagger is a 1946 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. Plot In 1944, a handsome bachelor and nuclear physicist named Alvah Jesper is working in the United States on the Manhattan Project to build a nuclear bomb. Recruited into the Office of Strategic Services, his mission is to make contact with a Hungarian nuclear physicist, Katerin Lodor, who has been working on the German project to make a nuclear bomb and has escaped into neutral Switzerland. Flown into Switzerland, Alvah finds it full of German agents who, after he manages one brief conversation with Katerin, abduct her. By befriending and then blackmailing Ann Dawson, an attractive American now a German agent, he discovers where Katerin is being held, but an OSS raid on the building fails and she is shot dead. In the conversation, Katerin had said that the Germans wanted her to work with an Italian nuclear physicist named Polda. The OSS land Alvah in Italy from a British submarine and he is hidden by an attractive member of the Resistance, Gina. He manages to obtain a brief conversation with Polda, who agrees to work with the Americans only if the OSS first frees his daughter Maria, who is being held by the Germans. The OSS raid on the building is successful and in an isolated safe house they deliver Maria to her father. He is horrified, because the woman is not his daughter but a German agent, who says the house is surrounded by German troops. In the ensuing gun battle, Alvah and Gina smuggle Polda out through a tunnel from the house to a nearby well and struggle across country to a rendezvous with a British aircraft which will fly them out. Polda and Alvah board it safely; although there is