Returning by train to the French port of Le Havre, Jacques Lantier, a tormented railwayman, meets by chance the impulsive stationmaster Roubard and Séverine, his wife.

The Marquis de la Chesnaye and his wife host a weekend gala where a variety of complicated romantic and social entanglements between guests and servants lead to tragedy, all against the backdrop of a looming war.

The owner of the place of Chamonix covets the inn, run by the Michel's uncle, whose business goes bad. Michel decides to participate in a ski competition to help uncle.