An ancient manor house stands decaying on a bleak and windswept moor. When David Filde, a young book dealer from London, arrives to catalogue the rare and valuable library of Lord Gray, it seems that someone – or something – does not want him to complete his work. Disturbed by incidents both inexplicable and unnerving, Filde must convince the sceptical Lord Gray to confront the truth about what is causing them. As they look for answers within the crumbling mansion, the two men unleash a terrifying chain of events.