I've read a lot of Chris Ryan's books and I wasn't sure what to expect with this one. I was pleasantly surprised however what a good read it was. The characters were in-depth enough for the plot and the length of the story and there is plenty of depth with the main character 'Zak'. Despite what other reviews say who give it a bad rating, I chose to ignore them and find out for myself what this book was like. Chris Ryan doesn't usually disappoint, so I was very happy when I found myself engrossed in this book wanting to read more and more as the story continued.. I really look forward to the next book in this series. Well done Chris!