Torn Curtain

Torn Curtain is a 1966 American political thriller film directed by Alfred Hitchcock, starring Paul Newman and Julie Andrews. Written by Brian Moore, the film is about an American scientist who pretends to defect to East Germany as part of a clandestine mission to obtain the solution of a formula resin and escape back to the United States.

Armstrong visits a contact, a farmer Mort Mills, where it is revealed that his defection is in fact a ruse to gain the confidence of the East German scientific establishment in order to learn just how much their chief scientist Gustav Lindt Ludwig Donath and by extension, the Soviet Union, knows about antimissile systems. While Armstrong does not inform the U.S. government of his plan, he has made preparations to return to the West via an escape network, known as . However, Armstrong is followed to this farm by his official body man, Hermann Gromek Wolfgang Kieling, an East German security officer assigned to him. Gromek realizes what is and that Armstrong is a double agent, and as Gromek is calling the police to report his suspicions, a tortuous fight scene commences that ends with Gromek being killed. So as to not arouse the suspicion of the taxi driver who brought Armstrong to the farm, a gun is not used to kill Gromek, but instead he is choked, stabbed, hit with a shovel, and, ultimately, gassed to death by Armstrong and the farmers wife Carolyn Conwell. Gromek and his motorcycle are then buried by the farmer and his wife. The taxicab driver Peter Lorre Jr., uncredited who drove Armstrong to the farm, however, reports on Armstrongs behavior to the police when he sees Gromeks missing person ad in the newspaper. The remains of Gromek are found the fate of the farmers wife is not given.Armstrong visits the physics faculty of Karl Marx University in Leipzig, where his interview with the scientists is abruptly ended when he is questioned by security officials about the missing Gromek. The faculty try to interrogate Sherman about her knowledge of the American Gamma Five antimissile program, but she refuses to cooperate and runs from the room even though she had agreed to cooperate and defect to East Germany. At this point, Armstrong secretly confides to her his actual motives, and asks her to go along with the ruse. He finally goads Professor Lindt into revealing

Source: Wikipedia