These books. Must. Be. Read.
Especially if you’re wanting to see some really expert character development.
Be warned, though. Failure to read the Books of the Change trilogy directly after The Crooked Letter will result in a lot of this. I struggled through The Blood Debt and into The Hanging Mountains a few years ago before I even realized there was an insert series.
Please check them out. To start you off, here is a free pdf of The Crooked Letter, which to my knowledge, is all fair and whatnot from the publishers.