
Léopold, valet de chambre to the avocat général Maître de Royssac, starts studying the penal code and, during his leave, becomes a judge in a "middle" court. His decisions are recognized as final. Léopold falls in love with Agnès, engaged to the two-faced Doctor Ventoux, who becomes "Le chat" when he plays the gangster. Léopold will help "Le chat" pull off the heist of the century, if he remains free to court Agnès. "Le Chat" doesn't play along. A fight breaks out between Léopold's gang and "Le Chat's" gang. The law must prevail.

Paul Meurisse
Léopold

Geneviève Page
Geneviève des Vallières

Paul Hubschmid
Doctor Ventoux / 'Le chat'

Micheline Luccioni
Arlette
Lutz Gabor
Fernand

Jacques Seiler
Albert

Henri Lambert
'La Quille'

Noël Roquevert
De Royssac

Fernand Berset
The giant

Paul Préboist
Ventoux's butler

André Weber
Pellegrini
Florence Blot
Nurse

Marcel Charvey
Maître d'hôtel

Louis Bugette
Crook
Béatrice Delange
Agnès's maid