** spoiler alert ** 
 The coordinates to Still Blue have been discovered, and the two factions are scrambling to be the first to get there. But Sable and Hess are holding Cinder, who holds the key to reaching Still Blue. Perry and Aria aren't about to leave Cinder in their custody, even if it means running a suicide mission to get him back. 
 As ends-of-trilogies go, Into the Still Blue was far more thematically consistent and less irritating than, say, Allegiant. Yet it still somehow didn't capture the brilliance of the previous two books, though that's not to say it was bad. Perhaps the most accurate critique I have is that it wasn't what I was expecting. I think I wanted, and would have liked, more of the Still Blue, more of the characters struggling to rebuild, and definitely more description of this place that was only a fable until now. Unfortunately, neither of the two POV characters were heavily involved with the early parts of settling the Still Blue, and once Sable and Hess are defeated, the book is practically over. 
 The early chapters are a bit choppy, probably because Aria and Perry are in the same place and interacting with each other. Thus, in order to capture the thoughts and ideas of both characters, the POV switches, which requires new chapters. When they split up again, the story smooths out and becomes more interesting because each chapter isn't telling us the same thing the last one did. 
 I have every intention of re-reading the trilogy at some point, and it's possible that my rating may go up when I have a chance to read all three books back-to-back instead of spread over a couple of years.