Prime Evil

In exchange for immortality, an ancient sect of satanic monks agrees to honor their dark lord with a blood sacrifice every 13 years. But in the modern era, finding bodies for the altar is not so easy. Setting up shop in New York City, the devil worshippers search for their next ceremonial victim. William Beckwith stars as the leader of the cult, and Mavis Harris is the nun who's on to his diabolical deeds. (official distributor synopsis)