A disillusioned rich American bets with a railroad worker that the latter will not be able to spend the 600,000 francs a month that he will pay him for a year. All the railwayman's attempts to win his bet fail but his daughter luckily conquers the American.

Jean Larivière receives an impromptu visit from his future father-in-law while Lina, his mistress, learning of his marriage, has come to make a scene. The baron is seduced by Lina, and Jean, noticing that Angélique, his fiancée, is not so bad after all, is very happy to marry her.