The 19th Wife, by David Ebershoff

A book about polygamy in the Mormon religion. How it started, how it died, and how it still lives on. Done in flashback form, the book is a bit of a struggle to navigate until you sort out all the characters.  You really have to be interested enough in the subject to get through the first 1/3 of the book. Combining historical fiction of a real 19th wife, with a modern day murder mystery it does pick up and everything ties up neatly at the end.

I found horrifying the effects on the children in this odd arrangement, and how many women were so isolated and so brain-washed. Very hard to believe this happened so recently and is very possibly occurring right now.