A psychological thriller that follows Millie as she moves her family to a new home, only to suspect her new neighbors, the Lowells, are hiding dark secrets, leading to a murder mystery with multiple twists involving the maid, Ada, and others. The story, set about a decade after The Housemaid's Secret, focuses on family dynamics and themes of domestic abuse, with Millie's husband Enzo and children Nico and Ada playing central roles alongside returning characters like Nina Winchester.