"Hélène Masson visits her friend Gérôme Savignat in the isolated rejuvenation clinic owned by Dr. Devilers and his partner Dr. Berbard. But after a series of tragic events, Hélène goes further in her investigation of the clinic."
Annie Girardot
as Hélène
Alain Delon
as Devilers
Robert Hirsch
as Jérôme Savignat
Michel Duchaussoy
as Bernard
Anna Gaylor
as Denise
Jean-François Calvé
as Me René Gassin
Guy Saint-Jean
as The cafe owner
Lucienne Legrand
as Lise de Riberolle
Gabriel Cattand
as Prosecutor of Boissiere
Anne-Marie Deschodt
as Henriette Lussac
Nicole Gueden
as The cafe owner's wife
Jurandir Craveiro
as Manoel
Joao Pareira Lopez
as João
Alvaro Luis Carrasquinha
as
Jeanne Colletin
as Camille Giovanelli
Robert Party
as Colonel de Riberolles
Jean Roquel
as Marcel Lussac
Roger Muni
as Paul Giovanelli
Jean Leuvrais
as Commissioner
Salvino Di Pietra
François Landolt
Gabriella Cotta Ramusino
Mauricette Pierson
Jacques Pisias
as Male nurse
Jacques Santi
as Le Quérec (uncredited)
Alain Jessua
Director
Raymond Danon
Producer
Jacques Dorfmann
Music
René Koering
Jacques Robin
Director of Photography
Hélène Plemiannikov
Editor
Geo Hury
Production Design
Writer
Assistant Director
Jean-Claude Ventura
Roger Curel
Adaptation
Yannis Kokkos
Set Decoration
Constantin Mejinsky
William Robert Sivel
Sound
Production Assistant
René Thévenet
Associate Producer