The books "Plan Zet" and "Days that shocked Czechoslovakia" summarize the results of many years of research by the famous Czechoslovak historian V. Kral on the problems of the Munich Agreement. The first of these books, containing the background of Munich, is already known to the Soviet reader. Now his attention is offered a work that tells about the most dramatic stage of the Czechoslovak crisis, which has grown into the crisis of the entire system of international relations. The documents and materials studied by the author in the archives of many European countries made it possible to trace the development of the events of the last decade of September 1938, which shocked not only Czechoslovakia, but the whole world, day after day and hour after hour.