The honeymoon in Italy of Guillaume and Eugénie de Puycharmois escorted by friend Sainfoin, a second-hand driver. Sainfoin's humor displeases Eugenie. Guillaume takes the wheel in such a way that it is necessary to hire a "driver", Yolande. Jealous, Eugenie asks Sainfoin to conquer Yolande. In the working car, two happy couples drive through the Italian landscapes.