I just finished reading this book - having pre-ordered it and received it the day it was released - and I was very happy with it. It was a very informative book, and I like that it focused more on OTMA considering there hasn't really been a biography just on the daughters before, and while they are mentioned in biographies about their parents or the revolution, it's never in such great detail. However, I found the end came a lot quicker than it could have - their captivity in Tobolsk and Ekaterinberg were condensed into about fifty to sixty pages or so, and I understand that there's a lot less information about that time of their lives since the diaries and such of the time were burned, but I felt like suddenly I was reading about their lives at Tsarskoe Selo and suddenly they were dead. I know their captivity only lasted about a year, but I personally didn't feel like enough detail was allotted to their lives in captivity, and that it seemed the author was speeding through it.
Regardless, though, I did find it a wonderful book and there were many little things in there that I didn't previously know (and having spent the past eleven years studying the Romanovs, and mostly focused on OTMA, it's always nice to learn new things). I also did find that they focused a lot more on other people when more information about the girls could've been noted - I don't recall reading about the incident in which Maria's tonsils were removed, and while it's only something that happened once, I did find that it would've been something worth going into a little detail about. Unfortunately, for a book about the girls, it felt like it was focused on the entire family with maybe one or two extra things about the girls. I've started reading The Diary of Olga Romanov: Royal Witness to the Russian Revolution and in the beginning of the book, I've already learned a little more about how Olga's mind worked as a child, before they even got into the diary portion.