Jennifer Corvino, the daughter of a famous actor, has had trouble with sleepwalking for some time. Her doctor said that it can develop a split personality. She discovers her alternate personality when she stays at a boarding school that was once the home of Richard Wagner. But someone has been killing the students, and it relates only indirectly to the criminal sanatorium nearby.

Director: Dario Argento

Writer: Dario Argento, Franco Ferrini

Actors: Jennifer Connelly, Donald Pleasence, Daria Nicolodi

Production: N/A