Oliviero Rouvigny (Pistilli), a failed writer and an alcoholic, lives in a crumbling mansion with his wife Irina (Strindberg), who is scared of Oliviero's cat, Satan, that used to belong to his late mother. To fight boredom, Oliviero organizes decadent parties for local hippies and humiliates and abuses Irina in front of the guests. After his mistress, a young student, is found murdered, Oliviero becomes the primary suspect. When he finds their maid dead on the premises, he decides to conceal it to avoid further suspicions.