The next monograph by A. A. Zdanovich examines the issues of ensuring the security of the Red Army troops in the Belarusian direction in the period from autumn 1943 to August 1944, including the strategic offensive operation Bagration. Based on recently declassified documents of the Smersh departments of the Belarusian and 1st Baltic fronts, as well as the Main Directorate of Counterintelligence of the Smersh NGO, introduced for the first time into scientific circulation, the author of the monograph reflected all areas of work of army security officers to counter the intelligence and subversive activities of the German special services, revealed many new successful operations of Smersh employees, which allowed them to keep secret the plans and the plans of the command, to ensure the suddenness of attacks by units and formations of the Red Army in the main areas of combat operations. At the same time, the author does not shy away from considering the difficulties that arose in a secret confrontation with the enemy.