Inspector Dumont and his deputy Inspector Queneau investigate the murder of a young woman. They learn that the victim was pregnant before her death and that she was the mistress of Mario, a shady playboy who had dumped her while she was with child. A doctor is first suspected but is he the real culprit?
| Actor | Role |
|---|---|
 Raymond SouplexInspector Querneau | Inspector Querneau |
 Philippe LemaireMario | Mario |
 Jean DavyDr. Delorme | Dr. Delorme |
| PPauline CartonConcierge | Concierge |
 André ValmyInspector Dumont | Inspector Dumont |
 France DescautJosette | Josette |
 Jeanne LionMaid | Maid |
 Clément ThierryGeorges | Georges |
 Bernard MussonGendarme | Gendarme |
| OOdette LemarchandPatient | Patient |
 René HellTramp | Tramp |
 Marcel MelracNot listed | Not listed |
 Paul MerceyNot listed | Not listed |
 Anne MayenNot listed | Not listed |
| RRoboliNot listed | Not listed |
| AAlbert RouyonNot listed | Not listed |