This so-so, occasionally effective horror film combines found-footage creepiness and haunted-house scares – but is stronger on mood than story. A believable Ethan Hawke gives it some grounding as Ellison, a struggling true-crime writer who moves into a suburban house notorious for an unsolved mass slaying. He immediately discovers a stock of 8mm movies which offer a distressingly vivid insight into the crime. Things start going bump in the roof space. A loopy final section exposes the flakiness of the film’s ideas.