This review will most likely contain spoilers for any previous books in the series, read at your own risk.
In Renegade, Cordell Scotten describes an alien species far different than that of the wolf-like pack in Book1. I found it a bit hard to relate to this new species as well as I could with the wolf creatures. I think that Scotten might have been trying a bit too hard to come up with complex aliens. Most of the unique mannerisms that were described seemed like they came out of nowhere. One thing that I did like from this book was that the relationship between Derec and Ariel is developed a bit more. Also, we start to understand a bit more about the Key of Perihelion.