Widowed at the age of twenty, Madame Boissière is a real mother hen, excessively brooding over her two sons Robert and Claude. She spoiled the marriage of one and kept the other away from any female presence. The latter runs off and marries a girl from the mountains. When his brother dies, the couple agree to return to live with Madame Boissière, who tries to separate them.

Daniel Bellanger, a night-club crooner, is a basically straight,honest man. He has just married Christiane, a cashier in a Montmartre hotel and his main objective in life is to live happily with his wife and Pierrot, the son she had of a former union. Unfortunately Daniel accepts the offer of his old friend Freddy to run a gambling den. The place is frequented by a host of dubious guys, among whom a hood named Mario. The latter finds Christiane to his liking and soon shows he is prepared to do anything to take her away from Daniel, including kidnapping little Pierrot.

Peter is commissioned by William to rob an Amsterdam bank. He wants to find out who li is working for. With the help of Corinne, a young prostitute, he investigates and approaches the bank.

Ricardo will try his luck in the capital after winning an amateur singing contest. He has many adventures. Kidnapped by gangsters, he is only freed by the intervention of his fiancée. Finally, the director of the "Folies Parisiennes" presents him with a contract.

Lyane is a singer and daughter of the producer of the operetta: "C'est une fille de Paris". She convinces the composer of the music, Jacques Kellermann, whom she loves, to sign her piece. The famous composer Jean Paget, who cannot put the work to his advantage, declares to Jacques that Lyane had a child by him. Shocked, Jacques breaks with the singer who soon knows the celebrity. Finally, he realizes that happiness is ready to be seized, because the beauty still loves him...