The 19th Wife / David Ebershoff / 514 pages

 
This was a truly fascinating book.  I started reading it because someone said it was a historical novel set in the late 1800's.
Indeed it was.  It concerns Ann Eliza, the 19th wife of Brigham Young.  She became an apostate and divorced him.  She became a crusade speaker across the United States which ultimately ended polygamy in the U.S. 
The other chapters of the book fast forward to a present day story of the "firsters", a renegade retro group of "Old School" Mormons and the story based on facts of recent news accounts from that type of group in southern Utah.
I highly recommend this book if you like history.