The wedding of Diana and Oliver, a decorated war hero, is nearing. Diana moves into an apartment in an otherwise empty, sprawling London house, where she starts having weird and terrifying dreams. It's hard to say for sure whether these frightening night terrors are just a sign of an uneasy mind, or a sign of something much worse. A pair of sleazy journalists are after Diana. She soon meets an American tourist named Jenny, who has a connection to the foreboding house and its dark history.