No final de 1972, o vigarista e ladrão Simon recebe uma permissão para celebrar o Ano Novo fora da Prisão La Santé. Quando estava indo para seu apartamento em Paris para encontrar sua amante Françoise, Simon percebe que um carro está perseguindo o seu táxi. No apartamento, Simon percebe que Françoise tem um amante e deixa o local sem ser notado. Simon lembra o Natal de 1966, quando ele viaja para para Cannes fora da temporada de verão com seu parceiro e amigo Charlot para assaltar a joalheria Van Cleef Arpels. Enquanto traça um esquema para roubar os joalheiros, Simon encontra a antiquária e intelectual Françoise cuja loja é vizinha de lado do alvo. Ele se apaixona por ela. Mas seu plano não funciona como previsto e Simon é preso.
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.
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.
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.
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?
