"Anthology film with three shorts each featuring a famous detective: Monsieur Wens, Lemmy Caution and Maigret."
Michel Simon
as Commissioner Jules Maigret (segment "Le témoignage d'un enfant de choeur")
Raymond Rouleau
as Inspector Wenceslas Vorobeïtchik, aka 'Wens' (segment "L'alibi de monsieur Wens")
John van Dreelen
as G'man Lemmy Caution (segment "Je suis un tendre")
André Dalibert
as Commissioner Malaise (segment "L'alibi de monsieur Wens")
René Génin
as Concierge (segment "L'alibi de monsieur Wens")
Arlette Merry
as Florence Garnier (segment "L'alibi de monsieur Wens")
Jacqueline Porel
as Denise (segment "L'alibi de monsieur Wens")
Maurice Teynac
as Heldinge (segment "L'alibi de monsieur Wens")
Reinhard Kolldehoff
as Hartner (segment "Je suis un tendre")
Inge Langdut
as Gisella Hauptmann (segment "Je suis un tendre")
Nathalie Nattier
as Michèle Leroy (segment "Je suis un tendre")
Pierre Sergeol
as Leblond (segment "Je suis un tendre")
Georges Tabet
as Hubert (segment "Je suis un tendre")
Christian Fourcade
as Justin (segment "Le témoignage d'un enfant de choeur")
Jérôme Goulven
as Simon Lesueur, second-hand dealer (segment "Le témoignage d'un enfant de choeur")
Alexandre Rignault
as Inspector Janvier (segment "Le témoignage d'un enfant de choeur")
Claire Olivier
as Madame Maigret (segment "Le témoignage d'un enfant de choeur")
Marguerite Garcya
as Justin's mother (segment "Le témoignage d'un enfant de choeur")
Jacques Morel
as Commentary (voice)
Louis Blanche
as Judge (segment "Le témoignage d'un enfant de choeur") (uncredited)
André Chanu
as (uncredited)
Jo Dest
Richard Flagey
Arsenio Freignac
as Lucas (uncredited)
Erich Frichs
Gaston Garchery
Pierre Goutas
as (segment "Le témoignage d'un enfant de choeur") (uncredited)
Hennery
as Director (uncredited)
André Kronefeld
Yette Lucas
as Second concierge (uncredited)
Robert Lussac
as Police Director (uncredited)
Henri Marchand
as Priest (segment "Le témoignage d'un enfant de choeur") (uncredited)
Raoul Marco
as Doctor (uncredited)
Albert Michel
as Brigadier (segment "Le témoignage d'un enfant de choeur") (uncredited)
Maryse Paillet
as First concierge (uncredited)
Nicole Rimbaud
Marcel Rouzé
Michel Vadet
Stanislas-André Steeman
Writer
Peter Cheyney
Jacques Companéez
André Germain
Director of Photography
Jules Calamy
Producer
Raymond Froment
Hans May
Music
Gabriel Rongier
Editor
René Moulaert
Production Design
Julien Rivière
Production Manager
Jacques Lebreton
Sound
Henri Verneuil
Director
Georges Simenon
Novel