Done at last, and honestly better than expected. 3.5 stars.

This takes us to yet another city. The team is trying to figure out the final missing piece of worldbuilding and in doing so, figure out what to do about Prof. 

I was invested at this point in the worldbuilding mystery. The whole time I am just raving to know WHAT IT IS that makes all this make sense. And also inexplicably, even though Prof exists more as a cardboard cutout than a real character, he's my favorite so I was interested in his storyline. This meant that I had the easiest time reading this book than either of the other two in the series.

The ending action and reveal(s) were good. There were an odd amount of things left just up in the air like, okay, I guess we're not explaining that. But this didn't make anything less emotionally satisfying, and I think it's fair, because I'm sure it would take at least three more books to get the full story. I'm glad there aren't three more books.

David was better here than ever, really, although Megan being back did up the annoyingness level. It objectively wasn't too bad, but I just had a long stretch in book two of their dynamic being blissfully absent, so I had forgotten how irritating they can be.

Overall, this book did what I wanted it to do, but this series remains my least favorite Sanderson work yet.