Kathrin, Sylvio, and Pierre are music students in Paris. Due to their financial difficulties, the bailiff Fogar is even forced to seize their musical instruments. However, he allows them to continue practicing with them in his warehouse. There, the trio meets the composer Duval, who is also struggling financially.

Norbert Lang inherits a hotel and has to deal with a multitude of problems at the end of the year. There's the pushy singer who wants to get closer to him than he'd like. The staff quickly takes off after arguments. When the heating starts acting up, he has to hire a repairman. But the repairman shows up with unexpected backup and causes even more chaos.

Catherine Miller's triumph at the Casino de Paris leads fashionable playwright Alexandre Gordi to ask her to create his next play. Flattered, Catherine moves into Gordi's villa near Cannes, escorted by her entire family. Only Jacques Merval, Gordi's secretary, disagrees. This is understandable, as it is he who writes the plays that Gordi, rather tired, simply signs. Jacques is a one-man band in every sense of the word, allying himself with the Casino manager to bring Catherine back to her music-hall successes. Despite a few clouds, and thanks to Gordi's generous intervention, he succeeds. Wasn't his only thought the happiness of the woman he loves?

The chorus girl Caterina Duval gets the chance of her life when hired as stand-in of a famous star. On the opening night Catarina is singing, dancing and stepping into the hearts of the audience.