James Mason

as Peter Vadassy

Lucie Mannheim

as Mme Suzanne Koch

Raymond Lovell

as Robert Duclos

Julien Mitchell

as Michel Beghin, intelligence chief

Herbert Lom

as Andre Roux

Martin Miller

as Walter Vogel

Clare Hamilton

as Mary Skelton

Frederick Valk

as Emil Schimler, alias Paul Heimberger

Patricia Medina

as Odette Roux

Anthony Shaw

as Major Anthony Chandon-Hartley

Laurence Hanray

as Police Commissioner

David Ward

as Henri Asticot

Valentine Dyall

as Warren Skelton

Joseph Almas

as Albert, the Waiter

Patricia Hayes

as Woman

Hella Kürty

as Hilda Vogel

Ivor Barnard

as P. Molon, chemist

Ernst Ulman

as Detective in Black Suit

John Baker

as Policeman

Mike Johnson

as Old Man

Victor Rietti

as Restaurant Owner

Hugo Schuster

as Inspector