Vivien and Ben Harmon and their daughter Violet relocate to Los Angeles from Boston and buy a large old house. As required by law, the real estate agent discloses that the previous occupants were the victims of a murder-suicide. The Harmons think nothing of it and concentrate on repairing their marriage that has come under strain following Vivien's miscarriage and Ben's subsequent infidelity with one of his students. Ben is a psychiatrist and will meet his patients in the house. They meet the neighbors, the eccentric Constance and her daughter Adelaide. Vivien also hires a housekeeper, Moira, but Ben and Vivien don't quite see the same person when they look at her. Violet is bullied at school and befriends one of her dad's patients who has serious psychological problems. Strange events begin to occur.