In Moscow, in the courtyard of a residential building, a bold crime took place: Kůzma Semyonovich Kopytov, a police officer, was murdered. Judging by the cut-off holster of the pistol, the attackers’ target was the weapon of the murdered man. The events that followed the murder confirmed this assumption. A gang of armed robbers began operating in the city. The best detectives of the MUR, led by Major Kostenko, begin their investigation.