In present day St. Petersburg, police major Igor Grom, an honest and skilled cop with unconventional methods, pursues a vigilante murderer in the mask of a plague doctor.

In December of 1925, renowned American dancer Isadora Duncan arrives at the Soviet-Latvian border, where she makes arrangements for her lover Yesenin to flee from the USSR. All he has to do is get on the train to Riga. The poet secretly travels from Moscow to snowy Leningrad, where he gets caught up in a crazy whirlwind of events. While trying to evade surveillance by secret services, he has a series of fateful encounters. He finds both solace and despair in the city’s criminal underground. Despite the many obstacles he faces along the way, he remains determined to reunite with Isadora.