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.

Pierre Blanchar
Flip

Simone Renant
Isabelle

Yves Vincent
Morezzi

Marcelle Praince
Mrs. Chanut

Suzanne Dantès
Mrs. Delacroix

Henri Crémieux
Cresat

Maria Mauban
Anne-Marie

René Blancard
Turnier

André Bervil
Tonio
Marion Tourès
Christine

Germaine Michel
Clémence

François Joux
Gratien

Pierre Juvenet
President Chanut

Albert Michel
Guardian
Janine Miller
Announcer