Saucy Jack has a possessed daughter who kills people in Edwardian London. No, this is not your typical slasher. The film looks fantastic, beautiful but atmospheric - actually, the visuals are a total antithesis of that sleazy and cheap period when it was made - and the characters are sympathetic and interesting. Angelic purity and innocence of psychotic Anna who does not know she is used by Jack to murder other people gives a nice contrast to her dangerousness. The sour but sympathetic psychiatrist who takes Anna to his family to study her and the impulses of murderers means well - and pays the ultimate price for it. Another great Hammer film and certainly much, much better than the average IMDb rating claims.