England's Tigon films the people behind Witchfinder General produced this boring 1969 effort, an early slasher movie, and Michael Armstrong who directed the entertaining Witchfinder rip off Mark Of The Devil directed. In swinging London, a group of friends are attending Frankie Avalon's dull house party and decide to go to a haunted mansion to hold a seance instead. When one of their group is brutally murdered the others abandon his body and flee the scene knowing that one of them is the killer. Boris Karloff was originally supposed to play the detective investigating the goings but was too ill to appear, so Dennis Price took the role instead. Armstrong wanted Ian Ogilvy to play the lead role, but American backers AIP insisted that the part go to Frankie Avalon (who was nearly 30 at the time and under contract to them). There are a few decent shock sequences and a liberal flow of blood, but this supposedly haunted house is more likely to induce sleep than give you nightmares.