The final book of the series, this is the one that wraps up the whole thing. I couldn't put it down, but I can't say I totally loved it, but that's because it didn't end the way I'd have chosen, and I felt that there were endings left undone, or not really done to any satisfaction. At least mine. But it was well written, and well plotted and I got a huge amount of satisfaction at having called the major plot twist from the very start of the series. I never doubted for a second that Alex's father was the High Court Fairy King. So there was that.
It's a series I'll miss, and re-read, but I'm happy the author got to end the story on her terms.