This was a really good book.
Like her others in this series, it felt crisp and fresh. I like her characters. Chase in anybody else's hands would be either obnoxious or -- worse -- the golden boy the author was in love with. Chase is neither. So many of her characters are fantastic.
Fourth books in action-adventure series usually weary me a bit. The stakes can't get any higher, we've met all the characters we're ever going to care about, they've powered up most of the way, there's no place for jokes and no time left for learning and discovering...and we get into the running-and-fighting-and-running-and-fighting drag.
This one got a bit of that, but managed to avoid some. Which is a notable achievement. I did wish it had a few more spots of rest and healing somewhere along the way (I don't care. You do NOT fight life and death battles every day for many days, watch people you love die, kill some folks/monsters every day, get invaded and nearly lose everybody you love over two consecutive days (days that included her best friend nearly dying, about sixteen different serious relation tramas with the love of her life, total relationship overhaul with her mother, etc), and then stay up for more than 24 hours doing seriously strenuous world-saving stuff ...eat some oatmeal, sleep for 8 hours, and be fresh, blooming, party-ready, and not in need of any therapy at all. Or even downtime to reflect, grieve, process, think it through. Please?
That aside...the relationship stuff actually really worked. I liked the fact that it wasn't just "everything gets worse for the hero until it all gets better again." There were minor wins along the way. Many of them were personal wins, some of them were tactical. Somebody actually came up with a reason for the main love interests to have massive drama that didn't reflect badly on either of their characters!
The fights were beautifully done. Her martial arts always feel realistic.
I want to see a movie of this, now.
Mostly, I had a great old time. I can't wait to see what Shelby Back writes next.