The story follows Ashley Smith, a bright yet lonely American studying in London, who is invited to spend Christmas with her classmate's family at a grand—but somewhat eerie—Cotswolds manor. What begins as a warm seasonal getaway becomes increasingly unsettling as Ashley narrates the days in her diary. With the festive backdrop, mounting tension, and the enigmatic Chapman family’s intentions shrouded in mystery, the atmosphere cracks with suspense: Is this a cozy holiday retreat—or something far more sinister?