The book of the famous scientist, professor of history at Yale University (USA) describes the life and worldview of the Russian sect, whose members " made themselves eunuchs for the Kingdom of Heaven " (Matthew 19:12). Having arisen in the 18th century, the sect survived until the Soviet period, preserving its faith and rituals despite persistent persecution. Engelstein's work brings readers into the context of the most important modern discussions about group and individual identity, about the formation of cultural boundaries and norms, as well as the socio-cultural consequences of their violations.