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.

A restaurant waiter and the telephone operator at the Palace of Cap Martin sympathize without ever being able to go out together, because their day off is not the same. In the meantime, the disappearance of the Prince of Roumelia, whom no one knows, is announced. The boy, with the complicity of the young girl, pretends to be the Prince. They have a happy day. But the deception is quickly discovered, they are fired. Fortunately, the real prince arrives and asks for their forgiveness.