As her marriage to decorated war hero Oliver draws near, well-heeled Diana moves into an apartment within an otherwise unoccupied, sprawling London house where she starts to experience strange and terrifying nightmares. But are these troubling night terrors merely the symptom of an unsettled mind, or the sign of something far more sinister at work? Diana, pursued by sleazy journalists, meets American visitor Jenny, who has a peculiar link to the gloomy home and its tragic past.