Maurice loves Juliet and Michael loves Lily. Romance blossoms on the hill. They are workers, artisans, and Lily has a real talent as a singer. But Claude's arrival brings trouble to their relationships. Maurice, jealous, approaches Lily. Singing in the streets, Lily quickly becomes a cabaret star.
Going to take up his post in Moukden, the forest engineer finds in a trainer from the cabaret "the midnight sun" a Russian princess, Armide, whom he once loved. He had met her in 1917 when the princess and her father were driven from their domain. Prince Ireniev is a gambler, a trickster, a matchmaker. Out of love for Armide, Forestier flew, and yet when he finds the two wrecks, he cannot resist. Abandoning everything, his position and his honor, he leaves with the woman of his destiny.
An aspiring singer tries to break into films during the early talkie era. She is hired to dub the singing and speaking voice of a silent-movie favorite. Sworn to secrecy, the fill-in must stand by in silence as the star receives all the praises and plaudits.
Foreign spies are interested in plans for a device invented by a French aviator. They kidnap the young man but fail in their business thanks to the energy of his wife and the cunning of the mechanic.
Returning from America where he received a large inheritance, Alaric would like to have a wedding before returning to the family home where his sister, who is as cantankerous as she is uncompromising on principles, awaits him. He asks a “porter” from the station who looks like him to replace him.
Jeanne De Pincret refuses to marry Viscount Haussy De Villefort, having discovered his frivolity. After a duel against the Duke De Montgobert, whom Louis XIV recommended to Jeanne, the king forced De Villefort to marry Jeanne, then sent her to war. Separated from her husband, Jeanne discovers that she loves him.
Stuck in Angoulême between her uncle, who composes classical music, and her aunt, who is a fan of contemporary music, young Irène finds life boring. Fortunately, there is swing music which illuminates her days. So when, one day, Raymond Serre and his swing orchestra come to Angoulême, she seizes the opportunity to slip the copy of a song she has written into the pocket of one of the musicians. The trouble is that while she is doing so, the train she has boarded pulls out.
