At the end of the 19th century, a series of mysterious murders occur in the provincial city of N. Metropolitan investigator Goremykin arrives at the crime scene. The search for the perpetrators leads to an unexpected conclusion – a revolutionary circle within the city, which consists of two young men recently returned from Switzerland.
MURA operative Konstantin Troshin returns from the front after the victory in the Great Patriotic War and finds out that he no longer works in the police. The reason is a conflict with an influential general of the NKGB of the USSR. But Troshin cannot imagine his life without the police. He manages to get a job as a precinct officer in the most disadvantaged area of Moscow — Maryina Grove.