Jessica (Blanca Marsillach) is locked in an intense, highly intense and sadomasochistic relationship with her saxophonist boyfriend, Johnny (Stefano Madia). When Johnny suffers a head injury in a motorcycle accident and slips into a coma, he is rushed to the hospital for emergency surgery. The attending surgeon, Dr. Wendell Simpson (Brett Halsey), is distracted during the operation due to a confrontation with his unfaithful wife, Carol (Corinne Cléry), causing Johnny to die on the operating table. Driven mad by grief and desperate for revenge, Jessica kidnaps Dr. Simpson at gunpoint and locks him in her isolated home. She subjects him to severe psychological torment, physical abuse, and sexual degradation to punish him. However, as the captivity continues, their volatile power dynamic shifts into an intense, twisted mutual obsession and sexual bond.