Jean Poiret as Inspecteur Jean Lavardin

Stéphane Audran as Madame Cuno

Michel Bouquet as Hubert Lavoisier

Lucas Belvaux as Louis Cuno

Jean Topart as Docteur Philippe Morasseau

Pauline Lafont as Henriette

Caroline Cellier as Anna Foscarie

Josephine Chaplin as Delphine Moreasseau

Andrée Tainsy as Marthe

Jean-Claude Bouillaud as Gérard Filiol

Jacques Frantz as Alexandre Duteil

Dominique Zardi as Henri Rieutord, Chef de Poste

Henri Attal as L'Employé de la Morgue

Albert Dray as André, le Barman

Marcel Guy as Le Maître d'Hôtel

Jean-Marie Arnoux as Le Client du Café