Based on the short story by Georges Simenon. Annoying Annette is bent on seducing Maurice, a handsome lawyer who has his eye on a haughty American Myriam who is running after bashful Bernard. The story takes place in hotels, prisons, and music-making apartments in Cannes.

A student from an elementary school accidentally breaks the glass roof of his school. His comrades decide to support it by working during the summer holidays in order to pay for reconstruction.

Somewhat reminiscent of 'Mädchen in Uniform' (1931), the story is set in a private girl's school, populated almost exclusively by children from broken homes. Among the few students who can claim family stability is Micheline Presle, but even her happiness is threatened when her lawyer father Andre Luguet inaugurates an affair with stage actress Jacqueline Debulac. With the help of Debulac's daughter Louisa Carletti, Presle is able to break up her father's romance and deliver him into the open arms of her mother Marcelle Chantal.

When Nathalie, a shoe seller, is abducted, her mother Flora wastes no time taking matters into her own hands. Reluctant to call in the police, she galvanizes her three other daughters into action.