

11/06/1952
Paul Dorgères, a wealthy industrialist, has been mysteriously murdered. The investigation is entrusted to the experienced Chief Inspector Bonnardel and his young rookie assistant, Inspector Richard. Suspicion turns to his mistress Catherine Villard, with whom he had just broken up on the night of the crime. She is soon arrested and charged. However, Inspector Richard discovers a button at the scene of the crime which could help him to trace the trail and confound the culprit(s).

Yves Deniaud
as L'inspecteur-chef Bonnardel

Yves Vincent
as L'inspecteur Richard, jeune assistant débutant de Bonnardel

Élina Labourdette
as Catherine Villard, maîtresse de Dorgères

Henri Crémieux
as M. Phalempeau, homme d'affaires

Robert Dalban
as L'inspecteur Sylvestre, adjoint de Bonnardel

Jean Debucourt
as Maître Landry, avocat pénaliste, ténor du barreau

Marie Déa
as Mme Le Mesles

Marcel André
as Le médecin légiste

Marthe Mercadier
as La détenue-manucure

Charles Dechamps
as Le juge d'instruction Ferrand

Henri Nassiet
as Paul Dorgères, homme d’affaires

María Riquelme
as Étiennette, la concierge

Guy Decomble
as Le concierge

Olivier Hussenot
as

Jean Barrère
as Pierre

Charles Vissières
as Le détective Henri Bouteiller

Marcel Delaître
as Le commissaire

André Dumas
as

Michel Etcheverry
as Bertrand Moal

Fernand René
as Le tailleur

Paul Villé
as Le maître d'hôtel de Dorgères

Julien Maffre
as L'hôtelier de Marseille

Zélie Yzelle
as La cuisinière de Dorgères

Madeleine Barbulée
as La voisine

Myriam Bru
as La nièce

Jacqueline Huet
as La vendeuse d'articles de maroquinerie

Odette Barencey
as Une femme

Alfred Adam
as Le vendeur de boutons (uncredited)

René Dupuy
as (uncredited)

Robert Lussac
as Le Mesles (uncredited)

Jacques Morlaine
as Un journaliste (uncredited)

Nadine Tallier
as Amélie, la soubrette (uncredited)

Ernest Varial
as Un homme (uncredited)
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