The plot of the series is based on a true story about a retired special forces soldier who for a long time kept poachers who encroached on Lake Baikal's nature in fear. The action takes place in a state reserve, where nature protection inspector Yuri Tarkhanov arrives. The reserve's chief hopes that he will improve the situation in these areas, as poaching has been a pressing problem here for many years. Tarkhanov learns from his colleagues that local fishermen "feed" the local authority, Fedor Yakushev.