Watch America's Book of Secrets Season 3 Online

It is one of the most secret organizations in America. A religion–based on the cosmic revelations of an inspired genius–that boasts more than 100,000 faithful followers throughout the world. We'll reveal the hidden origins, strict doctrine, secret language and celebrity allure of the wealthy and influential institution. Former Scientologists disclose the reasons they were drawn to the church–and why they left. Jenna Miscavige Hill, niece of Scientology's current leader, David Miscavige, describes her difficult experiences inside the organization. Former church executive, Mark Rathbun, demonstrates Scientology's most revered spiritual technology–the "E-Meter." And watchdog Tony Ortega explains the appeal of Scientology that draws in new members. Find out why some consider Scientology a spiritual choice and others consider it a road to ruin.