Moving to the Sussex countryside is a big undertaking for born townies Ollie Harcourt, his wife, Caro, and their 12-year-old daughter, Jade. But when they view Cold Hill House—a huge, dilapidated, Georgian mansion—they are filled with excitement. Despite the financial strain of the move, Ollie has dreamed of living in the country since he was a child, and with its acres of land, he sees Cold Hill House as a paradise for his animal-loving daughter, a base for his web-design business and a terrific long-term investment. Caro is less certain, and Jade is grumpy about being removed from all her friends. But within days of moving in, it soon becomes apparent that they aren't the house's only residents. At first it is only a friend of Jade, talking to her on Facetime, who sees a spectral woman standing behind her. Then there are more sightings, and increasingly disturbing occurrences in the house. Two weeks after moving in, Caro, out in the garden, is startled to see faces staring out of an upstairs window, from a room that holds the key to the house's dark history—a room which does not appear to exist.