Summary: Vlassov (Yul Brynner) is a Soviet spy. In France, Vlassov defects. He is whisked to the U.S.A., where Allan Davies (Henry Fonda) takes over the case. After polygraph tests and cross-examinations, Vlassov names several Western European agents who are also spying for the Soviets. Davies wants to take the listed agents into custody; meanwhile, those on the list start dying under mysterious circumstances. (imdb)

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AKA: Le serpent

AKA: The Serpent

Genre: Suspense/Thriller

Country: France

Directed By: Henri Verneuil

Written By: Gilles Perrault, Henri Verneuil

Starring: Philippe Noiret, Michel Bouquet, Henry Fonda, Dirk Bogarde, Yul Brynner, Virna Lisi, Henri Verneuil

More information at the Internet Movie Database