It took me a long time to finally finish this one. It's not entirely the book's fault; other things have come up. However, this was not the most exciting novel in the series.
This is a filler episode. It ties up a loose end from long ago, but it's basically setting things up for what's to follow, and it's a bit of a slog. There were some humorous bits, there was a little bit of interesting detail on the magic system. The action was a bit bland, aside perhaps for one scene which doesn't involve the primary characters.
Anyway, it wasn't bad, just not that exciting.