Poor Jan. In her late twenties, she’s lost both her job and her boyfriend at the same time. Pretty much directionless, she rents a remote cottage on the edge of a forest and settles down to start that novel she’s always wanted to write, and to try to sort out her future. All would be wonderful were it not for the tapping on the windows every night, the dog barking at something—or someone?—in the garden, and the continual feeling that she is being observed. Cut away to Ian and Emma, a young couple in the area, who have lost a second child to stillbirth, with both babies born deformed. Although they decide to no longer seek having children biologically, Ian becomes obsessed with trying to understand the cause of their misfortunes. These two narratives really crank up the suspense as Jan seeks to discover the nature of her nocturnal visitors while Ian slowly uncovers disturbing facts about his and Emma’s parentages. Eventually the two story lines converge, making for a super creepy, but satisfying, ending. Kudos to Stone for a thriller that relies on neither violence nor murder and manages to treat a medical condition with compassion, not exploitation. Reading groups will enjoy discussing the many moral dilemmas the novel presents.