The adventurer Jeanne de Valois-Saint-Rémy, descendant (by the left hand) of the king of France Henri II, and who claims to be "Countess de la Motte", imagines a tortuous plan to steal a magnificent diamond necklace that the queen Marie-Antoinette refused to buy from the jewelers Boehmer and Bassange.
Viviane Romance
as Countess Jeanne de la Motte-Valois
Maurice Escande
as Louis de Rohan
Michel Salina
as Count Nicolas de la Motte
Jacques Dacqmine
as Marc Rétaux de Villette
Marion Dorian
as Marie-Antoinette
Pierre Dux
as Cagliostro
Pierre Palau
as Boëhmer
Pierre Bertin
as Abbot Loth
Jean Hébey
as Louis XVI
André Philip
as Deschamps
Jean-Louis Allibert
as Camille Desmoulins
Pierre Magnier
as Prosecutor Joly de Fleury
