Patrick Dewaere
Role: Paul Kerjean
Michel Auclair
Role: Michel Saint-Claude, director of GTI-Europe
Caroline Cellier
Role: Hélène Kerjean
Charles Denner
Role: Walter, private detective
Anny Duperey
Role: Laura Weber, JBL's mistress
Jeanne Moreau
Role: Madame Benoît-Lambert
Mel Ferrer
Role: Cornelius A. Woaegen, president of GTI
Jean-Laurent Cochet
Role: Serge Hartmann, director of La Tribune
Fernand Ledoux
Role: Mr. Guérande
André Falcon
Role: Pierre Bayen, editor-in-chief
Claude Vernier
Role: Dr. Gerhard Kramer
Édith Scob
Role: Madame Bronsky
Jacques François
Role: Fred Great
Robert Party
Role: Jacques Benoît-Lambert, aka 'JBL'
Jean-Pierre Kalfon
Role: Bronsky, then Stan Hankins, the informant
Jean Mercure
Role: Joachim Holstein, Director of GTI-Austria
Claude Marcault
Role: Kerjean's secretary
Jacques Maury
Role: Jack Sleiter, director of GTI
Jacqueline Doyen
Role: Arlène Robert
Marc Eyraud
Role: Sylvestre
Jean Claudio
Role: Vittorio Orta, Director of GTI-Italy
Anthony Stuart
Role: Accuser
Hans Verner
Role: Kurt von Schroeder
Edward Marcus
Role: GTI controller
Pierre Londiche
Role: French interpreter in court
Camille Clavel
Role: Bastien Kerjean
Edmond Bernard
Role: Ralph von Lübeck
Frédérique Meininger
Role: Concierge
François Viaur
Role: Hotel receptionist
Marie-Pierre Casey
Role: Madame Benoît-Lambert's maid
Jacques David
Role: Police commissioner
Marc Fayolle
Role: Enthusiastic reader
Yaseen Khan
Role: Suta Burishawa
Roger Comte
Role: Waiter at the brasserie
Marie-Christine Rolland
Role: Secretary of the Walter agency
Yvonne Dany
Role: Germaine Guérande (uncredited)
Rachid Ferrache
Role: Éric Bronsky (uncredited)
Sacha Lavin
Role: Madame Bayen (uncredited)
Fabienne Mai
Role: Madame Holstein (uncredited)
Bernard Tachl
Role: The follower (uncredited)