The owner of a suburban boarding school is found murdered. The culprit will be unmasked thanks to the ingenuity and courage of the good Janine and a student, named Nadine.

Dora Doll
Jeanine - la servante

Françoise Vatel
Nadine
Guy Jacquet
Gérard Lambert

Joël Séria
Olivier Berton

Michel Dumur
Louis dit P'tit Lou

Louis Seigner
Monsieur Maréchal - le directeur de l'institution

Georges Chamarat
Monsieur Pommelle

Marguerite Pierry
Mademoiselle Guérande

Charles Bayard

Richard Bohringer

Pierre Clémenti
Jacques Degor

Mag-Avril
Un professeur

Maryse Martin
La directrice
Claude Mercutio