The zeal and dedication of Jehovah's Witnesses mask a highly disciplined organization that has a troubled history. Moreover, their thorough knowledge of their own scriptures gives a pretense of having spiritual truth. The movement has grown from about 1.1 million worldwide in 1965 to 4.4 million today. Yet all is not what it seems in the Watchtower Society. How do the teachings of the Jehovah's Witnesses run counter to orthodox Christianity? What drives adherents to give hundreds of hours a year to "witnessing"? What draws converts to a cult of strict control by religious leaders?