Isabelle is a lawyer who has Flip, a private detective, convicted of speeding. But shortly after, a murder is committed of which Isabelle's best friend is suspected. To save her, Isabelle is forced, despite her reluctance, to ask Flip for help, who agrees to look for the culprit.
| Actor | Role |
|---|---|
 Pierre BlancharFlip | Flip |
 Simone RenantIsabelle | Isabelle |
 Yves VincentMorezzi | Morezzi |
 Marcelle PrainceMrs. Chanut | Mrs. Chanut |
 Suzanne DantèsMrs. Delacroix | Mrs. Delacroix |
 Henri CrémieuxCresat | Cresat |
 Maria MaubanAnne-Marie | Anne-Marie |
 René BlancardTurnier | Turnier |
 André BervilTonio | Tonio |
| MMarion TourèsChristine | Christine |
 Germaine MichelClémence | Clémence |
 François JouxGratien | Gratien |
 Pierre JuvenetPresident Chanut | President Chanut |
 Albert MichelGuardian | Guardian |
| JJanine MillerAnnouncer | Announcer |
| YYvonne MénardDancer | Dancer |
 Odette BarenceyCook | Cook |
| HHenry MurrayCommissioner | Commissioner |
 André WasleyVictor | Victor |
| CChristiane DelacroixMaid | Maid |
 Henri NielPrison director | Prison director |
 Christian DuvaleixPhotographer | Photographer |
 Julien MaffreGentleman | Gentleman |
 Harry-MaxNot listed | Not listed |
| TTania SoucaultNot listed | Not listed |
 Gil DelamareNot listed | Not listed |
 Christian LudeNot listed | Not listed |
| MMichèle ClémentNot listed | Not listed |