The Prince Warriors by Priscilla Shirer and Gina Detwiler*

Evan and Xavier are typical brothers who know how to push each other's buttons.  Then one day they find themselves in strange land where the choices they make determine freedom or slavery.  New friends, Levi and Brianna,  also join them in these adventures where wearing your armor is vital for survival.
A great book to utilize when discussing with your children the armor of God.
My two sons loved this book and cannot wait for the second one in this trilogy (The Prince Warriors and the Unseen Invasion -publication date Oct. 15, 2016).
I thought the book began too slowly and I did not care for how Evan and Xavier treated each other.  But as the book progressed, the plot picked up the pace and relationships improved.
*Highly recommend.
-We own this book.