Due to financial problems, the boarding-school of Saint-Loup is on the verge of closing its doors. In desperation, Jacquelin, the headmaster, has the idea to invite former students to a fund-raising reunion. Among the alumni, three men whose common point is to have been in love at the time with the headmaster's niece. One is a banker, the second a priest and the last one a globetrotter. All of a sudden, the peace of the assembly is disturbed: Jacquelin's niece has just been murdered.
Bernard Blier
François Périer
Serge Reggiani
Pierre Larquey
Monique Mélinand
Odile Versois
Charles Vissières
Gabriel Gobin
Raphaël Patorni
Maurice Régamey
Pierre Mondy
Michel André
Jean Sylvère
René Berthier
Serge Grave
Johnny Chambot
Pamela Wilde
Jacques Denoël
Robert Pouget
Pierre Larquey
Georgette Anys
Jean Berton
Jackie Blanchot
Rémi Clary
Georges Demas
Robert Doncer
Lucien Frégis
Jacques Gencel
Lucien Guervil
Sophie Leclair
Serge Lecointe
Marcel Loche
Albert Malbert
Dominique Marcas
Jacques Mauclair
Bernard Noël
Émile Riandreys
Marcel Rouzé
Christian Simon
Germaine Stainval