The book tells about the secret operations of Soviet military intelligence, helps to find answers to questions: what information about Hitler's preparation for an attack on the USSR did military intelligence manage to get? How did JV Stalin feel about military intelligence data? Who else from the leaders of the Soviet state had access to the information of the Main Intelligence Directorate? How were intelligence taken into account in the General Staff? How did military intelligence officers act during the defense of Moscow and during the Battle of Stalingrad?