I've read every book in this series and the Dragon series, and so far have had nothing but praise for Knight.
This book is disappointing.
-What's up with the "let's bring back every major character from other books back"? This idea was poorly executed and becomes a bit too unbelievable.
-The characters are shallow. Compared to previous Valentine books, these guys are just zombies.
-The writing style itself is different. While the previous books were, for the most part, page turners, this one reads as if a boring college professor is discussing a small war in a country you don't care about.
-The main idea behind this book is pointless. Basically, if you don't read this book, you wont miss much.
However, Knight has proved that he can write a good book, and it's way too early to give up on him just because of one bummer.