A fictional work that reconstructs the unknown fate of the Marquis de Sade, the writer and sexual deviant who was imprisoned in an insane asylum for the last 10 years of his life. The Marquis de Sade befriends the director of the asylum and shares affections with the asylum laundress. When a doctor is sent in to cure the Marquis of his supposed madness, the Marquis's rebellious character only grows stronger.