It starts out really good, with a lot of elements and characters laid out to build suspense and great atmosphere, but by halfway through it narrows itself down to characters seriously wondering if an escaped stallion is behind the murders. Yes, a horse. And it tries to achieve a feel of all Hell breaking loose at the end with some psychedelic lights and crazy acting which both miss the mark. Worth seeing once, but I consider it to be to period-piece Hammer horror films what Space Mutiny was to Star Wars.
Oh, and in a dinner scene about halfway through, our heroine wears an outfit that somehow achieves an insupportable cleavage-to-breast ratio. Science geeks may want to study this scene just to see if they can figure out what laws of physics her corset's breaking. Really. Seriously.
Recently bought this in the Nightmare Worlds DVD 50-pack. Not sure if it's gotten its own release.