Will Atenton, a successful editor, leaves his job in New York City and moves with his wife, Libby, and their two daughters, Trish and Dee Dee, to a quaint town in New England for a quieter, more peaceful life. Soon after moving into their charming new home, Will and his family begin to experience unsettling events and realize that the house has a dark history. They discover that the previous occupants were brutally murdered, and a prime suspect in the case is Peter Ward, the husband and father who survived the attack. As Will starts to investigate, he becomes increasingly convinced that there is more to the story, and his family's safety may be in jeopardy.

During his investigation, Will finds unexpected allies in the form of his neighbor Ann, who has her own connections to the house's tragic past. The more Will uncovers, the more the lines between reality and imagination blur, escalating the tension within his family. He faces startling revelations about his own identity and the truth behind the murders, which force him to confront his deepest fears. The terrifying discoveries lead Will on a path that intertwines past and present, sanity, and madness, drawing him closer to the core of a mystery that will change his life forever.