The book analyzes the historical realities that led to the Katyn atrocity, - the liquidation of the Polish state and its army as one of the consequences of the signing of the Soviet-German treaties of 1939. - the difficult history of the Katyn case, the struggle against silence and falsification of circumstances, causes and motives of the crime, efforts to establish the falsity of the conclusion of the Burdenko commission and the entire Soviet "official version" presented in Nuremberg.