Denise, an orphaned girl, moves to Paris where she hopes to find work at her uncle's store. But the glamorous department store 'Aux Bonheur des Dames' across the street crushes all the little businesses around. She finds a position there.
Alcide Darbois, a small-time garage owner, and his sister Ursule come into a fabulous inheritance and become powerful industrialists. The cars they make a re very successful on the French market. Now a bit of a snob, Alcide decides to marry his daughter Suzanne to Marquis Gaëtan de la Michodière, but the young lady is actually in love with Bégonia, her father's chief worker. A car racing event will resolve the situation.
An imaginative wedding scene shot in silhouette, begins a tale of murder blackmail and romance covering a period of about 18 years, ending around 1923. Film composed of 10 episodes: 1.- L'Ami felon. 2.- Le secret de L'etang. 3.- L'Ambition au service de la haine. 4.- L'Implacable verdict. 5.- Le Pont vivant. 6.- La Voix du sang. 7.- Les Caprices du destin. 8.- En Champ clos. 9.- Les Angoisses de Corradin. 10.- Le Triomphe de L'amour.