This book introduces a number of new characters, and while Ryan does a good job with their development, they do seem like distractions from the people you care about. Overall, the plot is continuing well, they all tie into the main story well, but some of the subplots are unnecessary. 
 The language is considerably more frequent in this book, and more sexual. I'm more disappointed by that than any plot failings. It's kind of like Ryan knew the story wasn't as strong in the middle book, so he made up for by using extra profanity and sex. It's not graphic, but there is plenty implied, as well as a lesbian relationship thrown in out of the blue, apparently for no better reason than to be PC. 
 While the story is fascinating, and the characters are compelling, I can't recommend the book without a major caveat because too much of the content is offensive.