Virna Lisi

Nathalie Revent

Acting

Helmut Berger

Alain Revent

Acting

Charles Aznavour

Inspector Leroy

Acting

Alain Noury

Dino

Acting

Françoise Brion

Jacqueline

Acting

Édith Scob

Sylvie Revent

Acting

Marc Cassot

Vincent

Acting

Yves Brainville

Commissioner Dedru

Acting

Henri Crémieux

Professor Richet, psychiatrist

Acting

André Chanu

Doctor Schwartz

Acting

Georges Berthomieu

Toxicologist

Acting

Guy Marly

Chemist

Acting

Michel Peyrelon

Maître d'hôtel

Acting

Robert Le Béal

Judge

Acting

Dominique Marcas

Neighbor

Acting

Howard Vernon

Maître Wasserman, property administrator

Acting

Nicole Gobbi

Production

Jocelyne Jeanssen

Acting

Robert Audran

Acting

Paul Pavel

Delivery man

Acting

Robert Berri

Alain's concierge

Acting

Serge Berry

Acting

Paul Bonifas

Hotel porter

Acting

Elisabetta Fanti

Acting

Alberto Farnese

Alain's friend

Acting

Monique Mélinand

Neighbor witness

Acting

Roger Coggio

Alain Revent (voice)

Acting

Jacques Castelot

(uncredited)

Acting

Jacques Chevalier

Police inspector (uncredited)

Acting