R | | Horror, Thriller, Crime
A police detective uncovers a sinister occult explanation behind the mysterious death of a heroin-addicted prostitute.
Karen Black used a body double for all the nude shots of her filmed from behind.
SPOILER: The international DVD release by Telefilm is missing a scene (probably lost by a damaged print of the movie), when Christopher Plummer's character (Henderson) goes back to the apartment and finds a reel-to-reel tape with a Gregorian chant on it. It plays out and he accidentally drops it just before he hides when he hears footsteps. This is a fairly crucial scene in this movie.