https://www.amazon.com/Under-Banner-...dp/1400032806/
Do not expect an uplifting read. Essentially the story of violence fueled by certain groups of Mormon Fundamentalists, both historically and in relatively modern day. Be prepared for brutal murders because God said so, but also a lot of sexual violence.
It was not actually what I was looking for. I'm been reading more on fundamentalism and what makes fundamentalists tick again after taking a break from the topic for awhile. This is much more just a "this is what happened" sort of book that is more light on the "here's how it happened" part beyond the obvious.
I'm actually not sure I recommend it unless you're just interested in the history or would like more information on the social damage that polygamy causes. Again, not an uplifting read and there's no real moral high note at the end.