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.
Unfortunately the movie The Infernal Comedy: Confessions of a Serial Killer is not yet available on HBO Max.
| Directing | Matthias Leutzendorff | Director |
| Writing | Jack Unterweger | Writer |
| Directing | Michael Sturminger | Director |
| Writing | Michael Sturminger | Writer |
| Writing | Birgit Hutter | Idea |
| Writing | Martin Haselböck | Idea |
| Sound | Martin Haselböck | Conductor |
| Crew | Kirk von Heflin | Cinematography |
| Sound | Luigi Boccherini | Music |
| Sound | Ludwig van Beethoven | Music |
| Sound | Joseph Haydn | Music |
| Sound | Antonio Vivaldi | Music |
| Sound | Wolfgang Amadeus Mozart | Music |
