He was hailed as a reformed killer, a novelist who'd paid his dues. But Jack Unterweger, the Austrian serial killer, hid a sadistic secret. This chilling documentary reveals his horrifying tale of murder, rehabilitation, and the shocking truth behind his freedom. See how he fooled the world, before unleashing his gruesome spree once more. Will the truth behind his crimes ever fully be uncovered? Dive into the dark heart of one of history's most manipulative killers and unlock the secrets behind the case.