I am a big fan of this series, having read each book when they've come out. This one is my least favorite. I think it is more of a set-up book for, what I think, is the last book in the series. Reyes felt unnatural to me and there were more than a few times that I just didn't understand Charley and what she was doing all while being pregnant (9 months!!!). I didn't really believe that not only shouldn't she do some of her galavanting but that she couldn't do it. Then there was the annoying repeating. For some reason many facts were repeated. I'm okay with this in the beginning and it actually helps me remember where the last book left off, but some things were only a few pages away from each other.
BUT, I think everything is set up nicely for the last book and I am excited to read it. (and possibly a spin-off for Beep?)