Petrus, a Montmartre photographer, is accidentally wounded by Migo, a dancer at the Frou Frou night club, when she is trying to shoot her faithless lover Rodrigue, a counterfeiter. Though Petrus tries to reconcile the lovers, Migo lands up with him after Rodrigue is finally killed by another jealous dancer.

A brave bookseller raises his four daughters alone, all of whom he employs in his shop. They are especially interested in their sentimental stories. Rosine, the youngest, falls in love with Francis, fiancé of Edith, the eldest. But Francis pushes her away and Rosine announces that she is going to commit suicide. Bertrand, a young doctor, decides to stop her by watching over her. After a few adventures, everything finally works out. Edith keeps her fiancé, the father, from whom the adventure has been hidden, returns to the usual course of his life and Bertrand and Rosine find themselves alone.

Louberger, director of an orphanage, is full of praise for a former boarder, Mr. Sauval, who has become their benefactor. One night he arrives and he does not seem to be exactly the man described by Louberger. He has in fact become a crooked lawyer and he is wanted for a crime he has just committed. Despite his efforts he will not escape the police but he will manage to remain, in the eyes of the children, at the height of his legend.

After a Parisian haute couture house is robbed and jewels stolen, Commissaire Legrand leads the investigation. His suspicions fall on Linda, the great couturier. He decides to follow her to Nice to present her next collection.

Two paintings are stolen. Amateur private detective Roland Gautier investigates.