The Prince Warriors and the Unseen Invasion by Priscilla Shirer*

The Prince Warriors return to Ahoratos and receive new instructions.  Because of a choice by one of them, the Ents are now invading Earth.  As the Prince Warriors battle the "unseen invasion", they  must also conquer invasions within their own hearts.
For some reason I enjoyed this second book better than the first (which is usually not the case for me!).  Ms. Shirer has created a series with  likable, believable characters, exciting plot lines, and thought provoking scenarios about the spiritual battle we are in each day.
My boys love this series.  I think I will be purchasing book #3 for them!
*Highly recommend.
-We own this book.