The pages of the book detail the so-called radio games - one of the forms of special counterintelligence operations used by the special services of many countries during the Second World War. In 1941-1945, radio games became one of the forms of opposition to the Soviet special services of subversive activities of German intelligence. The radio games conducted by the NKVD-NKGB and the military counterintelligence Smersh (Death to Spies) in 1942-1945 actually turned into the "Big Game" on the radio and had a significant impact on the outcome of invisible battles on the fronts of the "secret war" between Soviet counterintelligence and the Abwehr and SD.