The Duchesse of Langeais is an 1834 novel by French author Honoré de Balzac. In this book
General Armand de Montriveau a war hero is enamored of Duchess Antoinette de Langeais a
coquettish married noblewoman who invites him to a ball but ultimately refuses his sexual
advances and then disappears. Assisted by the powerful group known as The Thirteen who
subscribe to an occult form of freemasonry General Montriveau finds the duchess in a Spanish
monastery of Discalced Carmelites under the name of Sister Theresa. Will the General's wishes
come through?