Sadly, this book just wasn't for me. By about the halfway point I was losing interest and towards the end, I was just skimming the pages. I don't have any fundamental issues with it and it appears to be well researched; it is not easy to take on subjects such as the one featured in this book.
My main issue was the plot. The events were repetitive and didn't seem to develop. I actually thought one of the subplots was far more interesting and would've liked to have seen it better developed and more prominent within the book.
From other reviews I have read, it is clearly very popular and I wish Erin all the best with her book.