Vlassov is a Soviet spy who defects in France. He is whisked to the U.S, where Allan Davies 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.
Yul Brynner
as Col. Alexi Vlassov
Henry Fonda
as Alan Davies
Dirk Bogarde
as Philip Boyle
Virna Lisi
as Mrs. Annabel Lee
Robert Alda
as Polygraph interrogator
Farley Granger
as Computer Programming Director
Philippe Noiret
as Lucien Berthon
Michel Bouquet
as Tavel
Martin Held
as Lepke
Guy Tréjan
as Deval
Marie Dubois
as Suzanne
Elga Andersen
as Kate Cross
