This is a good study in characters. And linguistics. Slower than its predecessor, I enjoyed it. The last 30% makes up for the lack of action of the first 70%, and it predictably ends with a cliffhanger. No worries though, because the tetralogy is complete.
More that I would expect from YA. The story is indeed complex enough to straddle the line between adult and YA, though the protagonists are teenagers and many of their anxieties relate to coming of age issues. Also, this is not a romance book. Kudos to the author.Humans were so circular; they lived the same slow cycles of joy and misery over and over, never learning. Every lesson in the universe had to be taught billions of times, and it never stuck.