Jane Trevally is walking her dogs on her country estate one May afternoon when a small white dog appears. The teenaged girl that had been staying nearby with the dog is nowhere to be found, and Jane decides to return it to his registered owner hours away in London, in the deepest backwaters of Hampstead. But when Jane arrives, she is immediately unsettled, because she has a dark history with this house. The man who answers the door tells her the dog, Hugo, must have been stolen from the Heath, but Jane very much doubts that is true. Through the window, she catches a glimpse of a haunted-looking woman, not the missing girl she'd hoped to find.