In Rome, a tourist who had just returned from the Trans-Baikal Zone was brutally murdered. To investigate the causes and circumstances that led to this crime, an Interpol investigator comes to Bulgansk. He is going to find a guide and follow the route of the murdered man, to restore in detail everything that he saw and did in the forbidden territory. Strange zeal, since Interpol mainly deals with paperwork... Or is he not an Interpol member at all?