Books by CJ Parmenter
There are currently two books in the Protectors of Xil series. The suggested reading order is:
White Feather (Protectors of Xil: Book 1)
Broken Unity: A Protectors of Xil Novella
However, that's just my suggestion. Broken Unity can be enjoyed either before or after you've read Book 1, or as a stand-alone adventure on its own.