Michael Roberts (Roy Lonnen) joins his friend Laura Stephens (Barbara Ewing) at an auction and talks her out of selling her newly-acquired mirror to a mysterious man (Simon Andrews) who seems excessively eager to have it. When Michael takes it from her to have it appraised, its occult powers put him in the path of Allison (the china doll-like Rosalyn Landor), who has just run away from a secret society that wants to sacrifice her in order to conjure up a powerful devil. The head of this society is Charles Randolph (John Carson), an evil hypnotist whom Michael will find extremely dangerous.
Don Sharp directs a script by David Fisher and delivers this amusing Hammerfied nonsense. It features sinister faces appearing in mirrors; a devil with a slimy, scaly green face; a racy bedroom scene; chicken blood; voodoo; a young woman in a revealing white dress that has two upside-down black crosses over the breasts; and a not entirely satisfying trick ending. Just remember that if you find yourself offering bread, salt and wine in your own house to an elegant stranger, he's probably hypnotizing you into performing a ritual that will give him possession of your soul. You wouldn't want that, would you?