A little Breton tries to save her boss's daughter an unhappy marriage.

After serving in the trenches of World War I, Jean Diaz recoils with such horror that he renounces love and personal pleasure to immerse himself in scientific research, seeking a machine to prevent war. He thinks he has succeeded, but the government subverts his discovery, and Europe slides with seeming inevitability toward World War II. In desperation, Diaz summons the ghosts of the war dead from the graves and fields of France to give silent, accusing protest.

Serge loves living it up but painting the town red has a price... too high for him! What to do then? Alfred, his servant and former pickpocket, has the solution : steal of course! No sooner said than done ! Or rather: No sooner said than tried... For when Serge, assisted by his mistress Gloriane acting as bait, he tries to rob a jeweler on the Place Vendôme of a precious diamond bracelet, he realizes that a gang of thieves have preceded him. Later on, he will learn that the boss of the gang is a Polish noblewoman, Countess Waldapowska.

Maxime, heir to an old provincial family, is deeply in love with Maud whom he makes his fiancée. But learning that the young girl's life has not always been beyond reproach, he refuses to marry her and returns to his castle in the company of his sister who, happier than him, has met a man worthy of being in Paris. love.