- Country: France, Italy
- Genres: Horror, Mystery
- Release: 1981-02-24
- Director: Riccardo Freda
- Writers: Antonio Cesare Corti , Riccardo Freda , Simon Mizrahi , Fabio Piccioni
- Language: Italian
- Stars: Stefano Patrizi , Martine Brochard , Henri Garcin , Laura Gemser , John Richardson , Anita Strindberg , Silvia Dionisio , Fabrizio Moroni
- Runtime: 92 min
- Awards: N/A
- AKA: Inconsciente (Portugal, Portuguese Republic) , Murder Obsession , To spiti tou tromou (Greece) , Murder Obsession (Follia omicida) (Italy) , Öldürme Tutkusu (Turkey) , Murder Obsession , Unconscious (Italy) , Murder Syndrome (Australia) , L'Ossessione che Uccide (Italy) , Satan's Altar (Greece) , Himomurhaaja (Finland) , The Wailing , Fear (United States of America) , Murder Obsession (United Kingdom) , Убийственное безумие , Murder Syndrome (United States of America) , Obsessão Assassina (Brazil) , Angoisse (France, French Republic) , Mördande drift (Sweden) , Mente nebulosa (Mexico) , Murder Obsession (Norway)
- Plot: Michael is a successful actor, but he has a scandal in his past: at a tender age he knifed his father to death. He and his girlfriend Deborah go to his mother's for the weekend, and are joined by the director and others from a recent film project. But they are given a rather cool reception by the superstitious housekeeper Oliver. Soon rude things begin happening to some of the guests, and Michael fears a repeat of his nightmare past is in progress.
- IMDB:tt0081286
Murder Syndrome Cast · · · ALL
Riccardo Freda
Director
Stefano Patrizi
Michael Stanford
Martine Brochard
Shirley
Henri Garcin
Hans Schwartz
Laura Gemser
Beryl
John Richardson
Oliver
Silvia Dionisio
Deborah
Fabrizio Moroni