Watch The Infernal Comedy: Confessions of a Serial Killer (2010) Official Trailer

In 1976, Jack Unterweger was convicted for the murder of Margaret Schaefer and sentenced to life in prison. While imprisoned, he committed himself to reading and writing, eventually earning literary respect both inside and outside the penitentiary. In 1984, his autobiography "Fegefeuer" (Purgatory) became a bestseller.