Burgundy 1728. Old count Antoine d'Eon is overjoyed. His daughter-in-law has finally given birth to a boy and he will at long last be able to transmit his inheritance to his son Pascal. At least this is what he thinks, for Pascal has concealed from his father the fact that his son was ... a daughter, his eighth daughter! Well, enough is enough and Geneviève has no other choice but become a boy first, then a soldier and even the special envoy of Louis XV, King of France, to Catherine II, the Czarina of Russia.
| Actor | Role |
|---|---|
 Andrée DebarGeneviève d'Éon / Charles, chevalier d'Éon, agent secret au service du Roi | Geneviève d'Éon / Charles, chevalier d'Éon, agent secret au service du Roi |
 Bernard Blierle baron d'Exter, le chef des espions à la solde des Prussiens | le baron d'Exter, le chef des espions à la solde des Prussiens |
 Dany Robinla comtesse De Monval, l'envoyée spéciale du Roi Louis XV | la comtesse De Monval, l'envoyée spéciale du Roi Louis XV |
 Gabriele FerzettiBernard Turquet de Mayenne | Bernard Turquet de Mayenne |
 Isa Mirandala tsarine Elisabeth Petrovana de Russie | la tsarine Elisabeth Petrovana de Russie |
 Jean Desaillyle Roi Louis XV | le Roi Louis XV |
 Simone Valèrela marquise de Pompadour | la marquise de Pompadour |
 Jacques Castelotle marquis de L'Hospital, l'ambassadeur de France en Russie | le marquis de L'Hospital, l'ambassadeur de France en Russie |
 Gisèle GrandpréBlanche d'Éon de Beaumont | Blanche d'Éon de Beaumont |
 Bernard LajarrigePascal d'Éon de Beaumont | Pascal d'Éon de Beaumont |