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.
Jeanine - la servante
Nadine
Gérard Lambert
Olivier Berton
Louis dit P'tit Lou
Monsieur Maréchal - le directeur de l'institution
Monsieur Pommelle
Mademoiselle Guérande
Un professeur
La directrice
Un inspecteur
(uncredited)