Released from prison under a New Year amnesty, a criminal tries to pick up the threads of a life changed not only by his daring plan to rob a jewelry store in out-of-season Cannes, but also by a very special someone he met there.

For the Marquis Barbezieux de Saint-Rosay, nobility is important. If anything can comfort her, it's her family tree. In order to erase any doubt he invites in his castle a cousin of his established in Scotland, whom he instructs to bring him his titles of nobility. A first person introduces himself, calling himself his cousin, but it's not him. Then one, then two, then three false cousins ​​appear in turn. Will the real Saint-Rosay of Scotland eventually present itself?

Jean-Pierre, a pianist, is also the composer of a revue he would very much like Maroni, a famous theater producer, to put on. Maroni is not interested. All he wants at the moment is to impose Violette, a pretty young singer whose career he supervises. He has her dressed up as a flower seller. When he meets her, Jean-Pierre, who does not realize that she is in disguise, falls in love with her at first sight.

Peter is a talented young composer who has so far not been able to get his revue “Traumschöne Nacht” in a music theatre. Behind the scenes of the “Alhambra”, a Paris music hall, he meets Violetta, a young up-and-coming artist. For her sake, Mr. Maroni, the director of the “Alhambra”, who is in love with Violetta but is rejected by her, has organized a costume party at which the young entertainer appears as a little flower seller. When Peter shows up there too, he believes that Violette is actually selling flowers.

A young kleptomaniac girl befriends a rich heiress whom she admires and goes with her to Saint-Tropez.

Around 1900, Zaza was the undisputed star of the "Variétés parisiennes". Bonded with pianist Cascard, she indulges in adventures and falls in love with handsome Bernard Dufresne. A short affair. Surprised by her friend's behavior, she believes he has a mistress in the provinces. In reality, he is married and Zaza, faced with her daughter, prefers to step aside. From now on, she'll live for her art, and will always refuse to renew her acquaintance with the man who made her suffer.

This is the disaster for the Veyron-Lafitte. Régine, the maid, has just given up her apron and the meal is not ready for the dinner guests, the Gachassins. Adèle arrives at their house as a maid and saves the day. Very quickly, the masters of the place realize that she has the gift of seeing the future. Adèle predicts that the Gachassins will not come, which will be verified.