In the year 1963 and then 1968, Czechoslovak Communist Party commissioned the historian Karel Kaplan, who -himself a party member, to investigate possible wrongdoings in the trials of the early 1950s. After an intensive study of the secret police archives, he wrote this devastating "report" about how the secret police forced physical and mental torture methods to force the accused for making false confessions (to stop the torture, save the lives of the relatives, or to strengthen the communist cause). It is a very descriptive book with limited analytical value, and the people who do not have the background knowledge about the Czechoslovak history, can be underwhelmed by the names and other references. Yet, if you can put up with it, it is a very valuable book.