1969 film by Alfred Hitchcock
Topaz is a 1969 American espionage thriller film directed by Alfred Hitchcock, and starring Frederick Stafford, Dany Robin, Karin Dor, John Vernon, Claude Jade, Michel Subor, Michel Piccoli, Philippe Noiret and John Forsythe. Based on the 1967 novel of the same title by Leon Uris, the film is about a French intelligence agent (Stafford) who becomes entangled in Cold War politics before the 1962 Cuban Missile Crisis and then the breakup of an international Soviet spy ring.
The story is loosely based on the 1962 Sapphire Affair, which involved the head of France's SDECE in the United States, the spy Philippe Thyraud de Vosjoli, a friend of Uris, who played an important role in "helping the U.S. discover the presence of Russian offensive missiles in Cuba."
Plot summary adapted from Wikipedia, licensed under CC BY-SA 4.0.