1891. Revolutionary ideas stir the minds of young people, who form clubs to discuss their ideas. But not everyone sees this as mere populism. A group calling itself “B.G.” works precisely and boldly. The governor-general who commanded the Siberian District is murdered, and the man who committed the crime presents documents belonging to Erast Petrovich Fandorin. Erast Petrovich accepts the challenge and begins investigating. Who are “B.G.”—and who stands behind all of this? What events led these people to become terrorists? And for what purpose did they decide to carry out all these terrible crimes?