This book is my favorite of the series so far. Nelson's narrative style has grown a lot with this book and it feels less like a Mormon Huckleberry Finn on the Western Frontier than the previous 4 books. The plot and characters were much more mature. The shifting between narrators and POV's did not annoy or unsettle me and made quite a deal of sense for the story.
This book deals with the beginning of the end of polygamy in the Mormon church. When the US made it illegal, there was quite a bit of persecution. This book is about the families torn apart by the law and the officers who enforced that law. While this book was slightly more "preachy" about the Mormon faith than the previous books, it didn't really bother me. The preachy moments were coming out of the mouths of fairly preachy characters, and it did more than just preach - it drove the plot forward. And while the author and even the characters make a strong case for polygamy in many circumstances, the author and characters are quick to show that just as it could be a way to make sure that destitute women and widows are cared for, it was frequently used for men, particularly church leaders, who were dirty old men and needed a new woman (sometimes very young woman) to bed.
All of these viewpoints are shown against the backdrop of Utah frontier life. Though it primarily is a human interest story about the moral issues of polygamy and the trouble caused by the law making it illegal, there is more than enough adventure for the western genre fan.