The commander of a military air base near Moscow committed suicide in his office. After some time, under strange circumstances, his predecessor died. What is this - a tragic accident or a planned criminal action? Colonel of the Ministry of Internal Affairs Lev Gurov was entrusted with understanding the circumstances of the case. He arrives at the scene and proceeds to interview potential witnesses. But they are stubbornly silent. Realizing that what kind of secret lies behind the death of the officers? that secret, Gurov is forced to go on a provocation that threatens him with mortal danger.