A compelling and sometimes disturbing look into more than 50 mysterious cults, complete with stories from ex-members and profiles of their often-enigmatic leaders.

With a decline in organized religion and an explosion in social-media followers and factions, our interest in cults, sects, and radical religions continues unabated. While groups such as the Moonies or the Children of God have been dismissed as harmless, the mass suicides, atrocities, attacks, extremist rhetoric, and spiraling wealth and power of some of the more recent movements suggest a darker side. Robert Schro