Hammer House of Horror (1980)

Australian antique dealer Laura Stephens buys an old mirror in a job lot at an auction. While she and fellow dealer Mike Roberts are looking at it, the sinister Simon Andrews makes a high offer for the mirror, but Laura turns him down. On the drive home, Mike Roberts picks up a runaway called Alison, who says she has escaped from the sinister Choronzan Society. During their chat she identifies the mirror as a 'scrying glass', a fact that leads Mike into a world of human sacrifice and devil worship.