1891. A ferment in people’s minds—revolutionary ideas are popular among the youth, revolutionary circles spring up everywhere. But it’s not only fashion for everyone.
A group calling themselves “B.G.” works precisely and boldly. A Siberian governor-general is murdered, and the killer is a man who presents documents in the name of Erast Fandorin. Erast Petrovich accepts the challenge and starts investigating. Who stands behind the letters “B.G.”? What turned them into terrorists? For what do they commit their bloody crimes?