The groom Danila, sent on an errand to Kazan, finds a Jerid throwing dagger near the dungeon. A set of three jerids makes up a “jid”. Where are the other two? And the zemstvo leader Stenka, helping to investigate the disappearance of a child from the house of boyar Troyekurov, ends up in the dungeons of the Moscow Kremlin. He guesses that the boy was killed. How are these two cases intertwined? Who is the killer and what secret do the dungeons keep? Four brave grooms and the Zemstvo Yaryzhka are again rivals in a matter of national importance.