Robert and Françoise Monier make a hot air balloon to fly to the stratosphere. After a visit to Venus, they return home, but have only aged 15 days whereas 25 years have passed on Earth.

Claude, who temporarily replaces his father at the head of a department store, falls in love at first sight with a pretty female customer. He finds out that she is named Solange and that she is the goddaughter of Professor Hauteclerc, who runs a private psychiatric hospital. To come closer to the girl of his dreams, Claude has a crazy idea: he pretends to be mad so as to be placed in Hauteclerc's institution.

Director of a music hall, the dubious Ribero, to save himself from bankruptcy, only hopes for the victory of his horse. An English lord enlists his crack Master Love in the race. Ribero will try to prevent its departure. He is thwarted in his dark projects by the lord's daughter, captain of a troop of girls, and by a wise and determined sportsman who does not hesitate, for the occasion, to become a jockey. Master Love wins the race, Ribero is confused, a few weddings are celebrated.

Agnès Bonnardet leaves her parents to marry Claude Sironi, a painter who becomes famous but loses his talent. Meanwhile Agnes acquires a style of her own as an artist, which makes Claude jealous of his young wife. One day, he sends one of his own paintings to the Bazar de la Charité, a very trendy Paris department store, instead of one of his wife's works as ordered. Afraid of her being mad at him, he locks her up in the cloak room. A dreadful fire suddenly breaks out and sets the building ablaze.