Once upon a time Orla was: a woman, a painter, a lover. Now she is a mother and a wife, and when her husband Nick suggests that their city apartment has grown too small for their lives, she agrees. She agrees again when Nick announces with pride that he has found an antiquated Georgian house on the Dorset cliffs—a good house for children, he says, tons of space and gorgeous grounds. But as the family settles into the mansion—Nick absent all week, commuting to the city for work—Orla finds herself unsettled. She hears voices when no one is around; doors open and close on their own; and her son Sam, who has not spoken in six months, seems to have made an imaginary friend. Four decades earlier, Lydia moves into the same house as a live-in nanny to a grieving family. Lydia, too, becomes aware of intangible presences in the large house, and she, like Orla, becomes increasingly fearful for the safety of the children in her care.