Secrets and Wives: The Hidden World of Mormon Polygamy

What do we really know about modern practicing polygamists—not fictional ones like the Henrickson family on HBO's Big Love?

We've seen the Fundamentalist Church of Jesus Christ of Latter Day Saints in the news, the underage brides in pioneer dresses on a Texas ranch. But the FLDS is just one of many groups that have broken with mainstream Mormonism to follow those parts of Joseph Smith's doctrine disavowed by the LDS Church.

Gaining unprecedented access to these communities, journalist Sanjiv...