White Sky. The Key to the Abyss

A tourist, who has just returned from the Transbaikal Zone, is brutally murdered in Rome. To investigate the causes and circumstances that led to this crime, an Interpol investigator arrives in Bulgansk. He intends to find a guide and follow the route of the murdered, to recreate in detail everything that he saw and did in the forbidden territory. A strange eagerness, since Interpol primarily deals with paperwork... Or is he not an interpol agent at all?