I have a taped copy of this movie ...... somewhere. It is quite special, so I was surprised to find it unlisted in guidebooks such as Mauldin's. An important element involves a demonic force trying to seduce a young woman when she gazes into a mirror. Maybe it's just me, but the idea of an evil force from inside a mirror trying to distort your view of reality and control you seems particularly frightening --- of course one thinks of Dead of Night (1945), the old classic horror film. Also, the scenes where the demon is being summoned are quite disturbing --- the makers of the film seem to have had some special insight into demonology. Bradford Dillman is already dead for most of the movie, but he plays a great haunted spirit on both sides of the grave, and Louis Jourdan is good as the calm, rational psychiatrist trying to help the woman by any means possible, including unorthodox ones.