Helene Ardouin
Margaret Lockwood
Inspector Calas
Hugh Sinclair
Andre Laurent
James Mason
Prof. Winkler
Raymond Lovell
Winker's Assistant
Rodney Ackland
Dany
Enid Stamp-Taylor
Gordon
Hartley Power
Delia
Jane Carr
Winkler's Assistant
Edana Romney
Story
Marcel Achard
Director
Brian Desmond Hurst
Associate Producer
Herbert Smith
Screenplay
Roy Carter
Jacques Companéez
Herbert Juttke
Script
Additional Dialogue
Lesley Storm
Wardrobe Designer
Hilda Collins