Renee Pelagie is practically an unknown, despite having been the wife of the Marquis de Sade for twenty-seven years and having given birth to three children. Young Renee Pelagie comes from a rich bourgeois family that aspires to join the aristocracy; Donatien Alphonse de Sade belongs to the nobility but lacks money. An arranged marriage seems inevitable: they marry in May 1763.
Five months after the wedding, Sade is locked in the tower of Vincennes for having kidnapped and abused a young girl. This will be only the first of a long series of imprisonments; Marquis happen thirty years of his life locked up in various institutions. However, Renee Pelagie try to help her husband as long as this is in a compromising situation. Throughout his life, this devoted wife deal with criminals, prostitutes and even bribe will masquerade as a man to help her husband escape from prison. But everything has a limit, even devotion Renee Pelagie by the Marquis de Sade.