Very good book, rushed ending. Untangling (view spoiler)[a timey-wimey-ball of such proportion is a dangerous job, and not everybody is a Moffat, (hide spoiler)] so it was a valiant effort, and the end made sense from a symbolic/character standpoint, but there was a simpler solution: (view spoiler)[ they didn't need to get rid of the human host, just the yeerk. So they could have kidnapped the fellow right after he was made a controller! (hide spoiler)]. 
 Could have used more Jake - or rather, a little bit of Jake actually reacting to Thing. C'mon, we all knew (view spoiler)[the reset button would be pushed - it's book 29.5, and Jake is on the cover of like 6 more. And it started so well, with the whole "his is the only death he'd be so cavalier about". I would have loved to see Jake react to getting a bullet in the brain before the battle even started. (hide spoiler)] 
 But in general, a good, wild ride.