Polygamist leader Warren Jeffs was sentenced to life in prison earlier this week. The sentence comes on the heels of his conviction in Texas on counts of sexually assaulting two children he had taken as his "brides." Jeffs is the head of the Fundamentalist Church of Jesus Christ of Latter Day Saints, or FLDS. The FLDS has thousands of followers who believe multiple marriages can bring eternal life. Jon Krakauer, who investigated the FLDS communities on the Arizona-Utah border for his book Under the Banner of Heaven, takes us behind the scenes of this growing religion to reveal shocking accounts of violence, polygamy, and undying faith.