cast
- James Mason
- Peter Vadassy
- Lucie Mannheim
- Madame Suzanne Koche
- Raymond Lovell
- Monsieur Robert Duclos
- Julien Mitchell
- Monsieur Beghin
- Martin Miller
- Herr Walter Vogel
- Herbert Lom
- Monsieur Andre Roux
- Frederick [Fritz] Valk
- Herr Emil Schimler
- Ivor Barnard
- The Chemist
- Valentine Dyall
- Mr. Warren Skelton
- Patricia Medina
- Madame Odette Roux
- David Ward
- Monsieur Henri Asticot
- Hella Kurty
- Frau Hilda Vogel
- Anthony Shaw
- Maj. Anthony Clandon-Hartley
- Lawrence Hanray
- Police Commissaire
- Patricia Hayes
- Jacqueline
- John Baker
- Policeman
- Mike Johnson
- Old Man
- Hugo Schuster
- Inspector Foumier
crew
- Lance Comfort
- Director, Producer
- Mutz Greenbaum
- Director, Cinematographer
- W.Victor Hanbury
- Director, Producer
- Eric Ambler
- Book Author
- John Davenport
- Screenwriter
- Lennox Berkeley
- Composer (Music Score)
- Sid Stone
- Editor
- William C. Andrews
- Art Director
- Arthur Ibbetson
- Camera Operator
