Tuol Sleng or S-21 was the secret prison of the communist Khmer Rouge in Cambodia. Comrade Duch and his workers put to death in S-21 over 14000 enemies of the State. These enemies of the party centre were treated like they were subhuman and animals and eventually all prisoners were ‘smashed to bits’ or annihilated. Like the horrors of the Nazi death camps, the Stalinist Soviet Purges or Mao’s Cultural Revolution, Pol Pot spared no sympathy for those that stood in his way. Once transferred to S-21, a prisoner could expect to have to fully denounce any fellow conspirators and confess totally to either real crimes or most often perceived imaginary ones. The use of torture was inevitable and screams from the prisoners kept neighbours in Phnom Penh up all night. Documentation for S-21 was immense and workers had to detail every confession and their actions to appease the Party Centre bosses and give the detainment and ultimate executions a quasi-legal framework. The author does a very thorough study of that evidence that is recovered and has interviewed the few survivors that escaped after the fall of the Khmer Rouge. Chandler attempts to explain the inhumanity. His obvious sympathy for the victims extends into attempts to understand the mindset of the guards. The psychological insights are profound and this most disturbing case study serves as a warning to our race over any future mistakes that can be made when places like S-21 spring up and crimes against humanity are perpetuated. This dark tale of horror is a compelling read and I have given it a five star rating.