A man goes looking for his missing brother in a country house, and finds it is home to a decadent society. Troubled by strange hallucinations and the warnings of a mysterious professor, he investigates further, and stumbles on a cult worshipping an ancient witch with human sacrifices. Horror, starring Boris Karloff, Christopher Lee, Mark Eden and Barbara Steele.

When his brother disappears, a man visits the remote country house where he was last seen. While the host seems outwardly friendly and his niece more demonstrably so, there's a feeling of menace in the air with the overhanging legend of Lavinia Morley, the Black Witch of Greymarsh.