Beautiful Redemption - Margaret Stohl, Kami Garcia
A really brief review (a reviewlet?) from http://irresponsiblereader.com/2015/01/21/review-catch-up-beautiful-redemption-breach-zone-chasing-the-prophecy-fiddlehead/" target="_blank">a blog post reviewing a handful of series-finales

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On the one hand, this was not at all like the rest of the series -- and yet it was a very fitting conclusion.  Garcia and Stohl wrapped up everything that needed wrapped up, answered every lingering question (not always as I expected), and generally, did so in an emotionally satisfying way. I wouldn't have thought that this book would lead to a spin-off series, but it fits.

If you're into Paranormal YA, this was a very satisfying conclusion, and probably the best of that genre I've read.
Source: http://irresponsiblereader.com/2015/01/21/review-catch-up-beautiful-redemption-breach-zone-chasing-the-prophecy-fiddlehead