Any military confrontation has a clear and hidden side. This book tells about the invisible front of the Great Patriotic War, about the activities of Soviet, German intelligence in the prewar and war years, about the intelligence operations of the Soviet services, in particular about radio games, provides brief biographies of some famous Soviet intelligence officers, and also describes the main planned or committed assassination attempts. on the leaders of the USSR and Germany and the results of detailed activities. At a frontier invisible to prying eyes, concrete individuals fought courageously, some of whom did more for their country than other numerous armed forces.