During the First World War, the Empyrée Montmartre, a Paris music-hall, is dedicated to patriotic revues whose star is the charming Mitsou. The young artist is not without talent but she is mainly well-connected. She is indeed the cherished mistress of Pierre Duroy-Lelong, a rich industrialist. One night, thanks to Petite-Chose, an ebullient singer-dancer and her co-star, she gets to know a handsome army, Lieutenant Bleu. Mitsou falls madly in love with him and Lieutenant Bleu is physically attracted to her. The trouble is that Bleu comes from a distinguished family and cannot put up with her lack of culture and artistic bad taste...

Max and Colette often bother the lawyer Vermorel to initiate divorce proceedings, then everything calms down. An anonymous letter escalates the disputes, it borders on disaster but living together has obvious charms.

Guy de Kerentrec est un jeune héritier oisif. Au casino il ruine littéralement le prince arabe Ali Bey qui voulant se refaire se retrouve avec une énorme dette de jeu. Ce dernier promet de rembourser dans quelques jours quand il aura trouvé l'argent.

En 1913 sur la côte normande, Fanny Villatte, jeune femme passionnée, impatiente de vivre et d'aimer, renoue connaissance avec Marcel et Raoul Deccourt. Mais la guerre éclate, bouleversant leur destin...