如果一代代人类都这副样子一直到世界末日近在眼前，那显然是不能接受的。A group of documentary filmmakers are filming a TV special about the events which occurred at the famous and mysterious abandoned Cain Hill asylum many years earlier, and the unexplained abductions and murders that have occurred at the site since then. The group soon learn that one of the inmates never left Cain Hill at all.
