James Mason
— Peter Vadassy
Lucie Mannheim
— Mme Suzanne Koch
Raymond Lovell
— Robert Duclos
Julien Mitchell
— Michel Beghin, intelligence chief
Herbert Lom
— Andre Roux
Martin Miller
— Walter Vogel
Clare Hamilton
— Mary Skelton
Frederick Valk
— Emil Schimler, alias Paul Heimberger
Patricia Medina
— Odette Roux
Anthony Shaw
— Major Anthony Chandon-Hartley
Laurence Hanray
— Police Commissioner
David Ward
— Henri Asticot
Valentine Dyall
— Warren Skelton
Joseph Almas
— Albert, the Waiter
Patricia Hayes
— Woman
Hella Kürty
— Hilda Vogel
Ivor Barnard
— P. Molon, chemist
Ernst Ulman
— Detective in Black Suit
John Baker
— Policeman
Mike Johnson
— Old Man
Victor Rietti
— Restaurant Owner
Hugo Schuster
— Inspector