Still trying to erase the traces of a dark past, Peggy begins a new life with her new husband in an isolated house set in the grounds of a quiet boarding school. In this mystery and horror tale by Jimmy Sangster, the silence behind the walls gradually turns into an eerie threat. Amid the school’s eerie atmosphere, the shadow of a mysterious one-armed man pushes the young woman to the limits of her sanity. While everyone believes she is merely imagining things, the insidious danger lurking nearby draws closer with each passing moment.