Serial killers - psychotic, sadistic, the haulers of terror and obviously unnatural. And Germany's infamous serial killer Peter Kurten fits the bill. With his ruthless acts of brutality, he quickly earned monikers like the Vampire and the Monster of Dusseldorf. The landmark trial of Peter Kurten sounded easy to win as his defence attorney Dr. Justus Wenher had to only prove his insanity, not his innocence. The young lawyer embarked upon this seemingly straightforward case, only to find himself questioning, who is normal.