Eight-year-old Peter is emotionally distant from his parents Mark and Carol. Following an argument about trick or treating at Halloween, Peter hears noises in the walls of his bedroom, which Mark and Carol dismiss as wild imaginings. Peter listens intently and he hears a voice, who identifies herself as Sarah. She begs the boy to help her escape from her prison. Supernatural horror thriller, starring Lizzy Caplan, Woody Norman and Antony Starr