After a doctor kills his mistress and himself while researching the mysterious previous owner of his Boston home, his colleague, Dr. Norman Boyle, takes over his studies and moves his family into the Boston mansion. Soon after, Boyle's young son Bob becomes plagued by visions of a young girl, who warns him of the danger within the house.
| Actor | Role |
|---|---|
 Catriona MacCollLucy Boyle | Lucy Boyle |
 Paolo MalcoDr. Norman Boyle | Dr. Norman Boyle |
 Ania PieroniAnn, the Babysitter | Ann, the Babysitter |
 Giovanni FrezzaBob Boyle | Bob Boyle |
 Silvia CollatinaMae Freudstein | Mae Freudstein |
 Dagmar LassanderLaura Gittleson | Laura Gittleson |
 Giovanni De NavaDr. Freudstein | Dr. Freudstein |
| GGianpaolo SaccarolaDaniel Douglas | Daniel Douglas |
 Carlo De MejoMr. Wheatley | Mr. Wheatley |
| KKenneth A. OlsenHarold | Harold |
 Teresa Rossi PassanteMary Freudstein | Mary Freudstein |
| EElmer JohnssonCemetery Caretaker | Cemetery Caretaker |
| RRanieri FerraraVictim | Victim |
 Daniela DoriaFirst Female Victim | First Female Victim |
 Pino ColizziPeterson (voice) (uncredited) | Peterson (voice) (uncredited) |
 Lucio FulciProfessor Muller (uncredited) | Professor Muller (uncredited) |