I started the series with this book, like I did with the 39 clues books, and read the series just for the sake of this one. I was confused by the plot an motivations of the characters and the book seemed to do the " Anastasia thing" with the royal family becoming angels and the revolutionaries becoming demons because the enemy of my enemy is my friend. I'd hope for more depth but oh well. I may reread this after reading 4 and 5 that I never did, but that'll wait.