The fascinating retro-detective perfectly preserves and develops the traditions of Boris Akunin’s works about the adventures of the detective Fandorin. The young detective Ilya Ardov, who has a phenomenal memory, is investigating a very strange incident: a boar’s head suddenly appeared in the commerce office of advisor Kasyan Kostoglot. Someone's stupid trick? Or a mysterious sign? A series of inexplicable, seemingly unrelated deaths forces Ardov to radically change the direction of his search. Will he be able to beat an invisible opponent? There are almost no chances - the mysterious player is unusually cunning and cruel. And he will remain in the shadows as long as Ardov is alive. There are no other options. Well, that means you have to sacrifice yourself...