A scientist who have discovered how to turn salt water into petrol dies before he has revealed his formula. By mistake it's assumed that his assistant knows it although he does not.
Edwige Feuillère and Pierre Richard-Willm star in director Jacques de Baroncelli's adaptation of the Balzac novella The Duchesse de Langeais, which tells the tale of a Parisian socialite who is romantically pursued by a Napoleonic war hero. With a screenplay by Jean Giraudoux.
In the 13th century, lovers hurried to the door of Marguerite de Bourgogne. The aristocrat who every day was indulged in orgies that were famous throughout the country. What the suitors do not know is that they will inevitably be executed the day after these festivities and thrown to the Seine.
