When his brother disappears, Robert Manning (Mark Eden) pays a visit to the remote country house he was last heard from. Although his host Squire Morley (Christopher Lee) is outwardly welcoming - and his house-keeper's beautiful niece Eve (Virginia Wetherell) is willing to fulfil his needs - Manning detects a feeling of menace in the air with the legend of Lavinia (Barbara Steele), the Black Witch of Greymarsh, hanging over everything. Will the village's renowned expert on witchcraft, Professor John Marshe (Boris Karloff), be able to shed light on the wicked going-ons at Craxted Lodge?
This adaptation from Lovecraft’s 'Dream in the Witch House' was shot in Grims Dyke, the allegedly haunted house of W S Gilbert of Gilbert and Sullivan fame. It is remarkable for being the only time that Lee, Karloff and Steele appeared in the same film and is also the last British film to star Karloff, which was innovatively filmed by John Coquillon.