In this three-part documentary on the infamous Belgian child murderer Michel Stockx, we deep dive into the process leading up to his conviction and the years of mystery that follow. Not only was he found guilty of rape and murder of three children, he also remained a suspect in several other cold cases. What made him capable of such gruesome murders? And what allowed him to strike time after time? Although his involvement seemed clear, the cases are still haunted by questions for truth. On the basis of interrogation reports, interviews with people involved, and reconstructions of his actions, we are presented an image of how a cold blooded murderer could go about.