Investigator Sergei Kovalev is investigating the murder of Colonel Evseev and his family, hiding from the leadership that Evseev is his half-brother. According to one version, the surviving bandits from the Butcher's gang, which the colonel had previously destroyed, were involved in the murder. Similar murders have been happening for several years. An elusive gang robs and brutally kills employees of the state drug control, traffic police, police and ordinary civilians. And it seems that Sergey's colleagues are involved in the case.