About the whims of fate, the kind, handsome Edouard, a mediocre swindler who makes his living in Paris by reselling cars, becomes the crown prince of Montenegro. He settles in his family castle in Switzerland, leads a life of luxury: suits from the best tailors, gourmet meals, a series of luxurious receptions, easily seduced girls and... ruin. The castle is sold for debts, and Edouard almost dies from wounds inflicted by a maniac.