"Marie-Chantal travels by train to her cousin's place to spend a winter holiday, when a stranger entrusts her with false jewels that contain a virus powerful enough to destroy all humankind."
Marie Laforêt
as Marie-Chantal
Francisco Rabal
as Paco Castillo
Serge Reggiani
as Ivanov
Charles Denner
as Johnson
Stéphane Audran
as Olga
Akim Tamiroff
as Prof. Lambaré / Dr. Kha
Roger Hanin
as Bruno Kerrien
Antonio Passalia
as Sparafucile
Pierre-François Moro
as Hubert de Ronsac
Robert Burnier
as A Swiss Gentleman
Gilles Chusseau
as Gregor
Eugenio Di Petra
as
Onofrio Arcoleo
Gérard Tichy
as Maitre d'Hôtel
José María Caffarel
as (as Caffarel)
Henri Attal
as Dumont
Bernard Papineau
Lahcen Boukish
as Thug in a Bournous
Serge Bento
Claude Chabrol
as Bartender (uncredited)
Jacques Hilling
as (uncredited)
Albert Michel
Catherine Bernard
Editorial Services
Gregorio García Segura
Music
René Demoulin
Production Director
Guy Littaye
Production Design
Georges de Beauregard
Producer
Pierre Jansen
Pierre Gauchet
Colette Roy
Production Secretary
André Girard
Conductor
Abderhamane Benkirane
Assistant Production Coordinator
Alexis Poliakoff
Second Assistant Director
Pierre Colombier
Musician
Carmen Fatum
Makeup Artist
Paul Bonis
Assistant Camera
Suzanne Faye
Continuity
Jean-Claude Marchetti
Sound Mixer
General Manager
Claude Bakka
Guy Odet
Sound Engineer
Lucio D'Attino
Mohamed Osfour
Claude Zidi
Camera Operator
Roger Scipion
Production Supervisor
Philippe Fourastié
First Assistant Director
Guy Villette
André Dino
Still Photographer
Gérard Beytout
Unit Production Manager
Writer
Yves Christian Fournier
Scenario Writer
Director
Daniel Boulanger
Dialogue
Jean Rabier
Director of Photography
Jacques Gaillard
Editor
Monique Fardoulis
Assistant Editor