| Person | Type | Job | Role(s) |
|---|---|---|---|
 Georges Simenon | Crew | Writing | Novel |
 Hans May | Crew | Sound | Music |
 Henri Verneuil | Crew | Directing | Director |
Jacques Companéez | Crew | Writing | Writer |
Jacques Lebreton | Crew | Sound | Sound |
Jules Calamy | Crew | Production | Producer |
Peter Cheyney | Crew | Writing | Writer |
Raymond Froment | Crew | Production | Producer |
René Moulaert | Crew | Art | Production Design |
Stanislas-André Steeman | Crew | Writing | Writer |
Gabriel Rongier | Crew | Editing | Editor |
André Germain | Crew | Camera | Director of Photography |
Julien Rivière | Crew | Production | Production Manager |
 Albert Michel | Cast | Actor | Le brigadier (uncredited) |
 Alexandre Rignault | Cast | Actor | L'inspecteur Janvier |
 André Dalibert | Cast | Actor | Le commissaire Malaise |
 Arlette Merry | Cast | Actress | Florence Garnier |
Arsenio Freignac | Cast | Lucas (uncredited) | |
Christian Fourcade | Cast | Justin | |
 Claire Olivier | Cast | Actress | Madame Maigret |
Georges Tabet | Cast | Actor | Hubert |
 Hennery | Cast | Le directeur (uncredited) | |
 Henri Marchand | Cast | Actor | Le prêtre (uncredited) |
 Jacqueline Porel | Cast | Actress | Denise |
 Jacques Morel | Cast | Actor | Commentaire (voice) |
 Jo Dest | Cast | Actor | (uncredited) |
 John van Dreelen | Cast | Actor | Le G'man Lemmy Caution |
 Jérôme Goulven | Cast | Actor | Simon Lesueur, le brocanteur |
Louis Blanche | Cast | Le juge (uncredited) | |
 Marcel Rouzé | Cast | Actor | (uncredited) |
Marguerite Garcya | Cast | La mère de Justin | |
 Maurice Teynac | Cast | Actor | Heldinge |
 Michel Simon | Cast | Actor | Le commissaire Jules Maigret |
Michel Vadet | Cast | Actor | (uncredited) |
 Nathalie Nattier | Cast | Actress | Michèle Leroy |
Pierre Goutas | Cast | (uncredited) | |
 Pierre Sergeol | Cast | Actor | Leblond |
 Raymond Rouleau | Cast | Actor | L'inspecteur Wenceslas Vorobeïtchik dit Wens |
 Reinhard Kolldehoff | Cast | Actor | Hartner |
 René Génin | Cast | Actor | Le concierge |
Robert Lussac | Cast | Actor | Le directeur de la police (uncredited) |
Yette Lucas | Cast | La deuxième concierge (uncredited) | |
 Raoul Marco | Cast | Actor | Le docteur (uncredited) |
Richard Flagey | Cast | (uncredited) | |
Maryse Paillet | Cast | Actress | La première concierge (uncredited) |
 André Chanu | Cast | Actor | (uncredited) |
Inge Langdut | Cast | Gisella Hauptmann | |
Gaston Garchery | Cast | (uncredited) | |
Nicole Rimbaud | Cast | (uncredited) | |
André Kronefeld | Cast | (uncredited) | |
Erich Frichs | Cast | (uncredited) | |
| Person | Type | Job | Role(s) |
