The Outlaw Demon Wails was my favorite book in this series, but I must have deleted my review previously since it wasn't received well.

This book is the pinnacle in the series for character development and plot progression. The characters are maturing, and new details are revealed. This book isn't completely dialogue based as a few of the newer ones have been, and nothing is stale. I could probably read about these characters doing just about anything, but my preference would be that the future books take after this one with a heavy dose of plot progression and character development. Best in the series.