Sam Brower worked for seven years to crack open the secretive world of the polygamous Fundamentalist Church of Latter Day Saints (FLDS).
His work led to the arrest and conviction of prophet Warren Jeffs, who is currently serving a life sentence plus 20 years in a Texas prison for child sexual assault.
Brower's book, Prophet's Prey, detailing the investigation, has been made into a documentary of the same name, with music and narration by Nick Cave. It is screening at the NZ International Film Festival.
Sam Brower talks to Wallace Chapman about his work.