The synopsis goes something like this ...
Curtis (Ellison), a Scotland Yard police inspector, and Christy (Theather Thatcher), a female detective fascinated with the occult, have their work cut out for them when they investigate a savage attack on Oliver Hammond (Howard), a wealthy aristocrat. The superstitious butler, Walton (Halliwell Hobbes), believes that a creature who has menaced the Hammond family for years is on the prowl again. The detectives' search through the Hammonds' gloomy old mansion yields secrets that certain people are desperate to keep hidden.