1895. Nizhny Novgorod is preparing for the largest trade event of the year - the fair. But in the measured and prosperous life of the city, a high-profile murder of the richest man - the leader of the provincial nobility Nefedyev - occurs. A Nizhny Novgorod detective, Alexei Lykov, takes on the task of solving this case. Step by step, he encounters evil that goes beyond his understanding. And in order to defeat it, he puts everything on the line: love, honor, and even his life.