In 2011 Anemari Jansen unexpectedly got an opportunity to meet Eugene de Kock in jail. She was immediately fascinated by the man "with the soft voice," the former commander of Vlakplaas who was dubbed Prime Evil by the media. She won De Kock's trust and for the next three years went on a journey to find out more about the man behind the persona and the era in which he committed his crimes: she visited Vlakplaas, did countless interviews with his former Koevoet and Vlakplaas colleagues and Sunday after Sunday visited De Kock in the old Pretoria Central prison. Jansen simply had to know: How did...