Obscene Desire(1978)

Amanda, a beautiful American girl is soon to be married to Andrea Orsomandi, a wealthy nobleman who lives in an extravagant Gothic mansion. However there exists something dark, sinister and supernatural within the walls of the mansion. It seems that Andrea has been driven to madness and is a victim of the evil contained within the house. It soon transpires that he is involved in black magic, perverse rituals and serial killings with the aid of his sadistic henchman and gardener Giovanni. Killing prostitutes in order to exorcise this Evil. Now the demonic forces set out to possess Amanda,take her soul and turn her into another victim of the mansion.