D.J. MacHale 
Pendragon: The Soldiers of Halla [EPUB ebook] 

Nine battles for nine territories have brought Bobby Pendragon to where he is now: The final showdown. Bobby and the rest of the travellers must join forces in an epic war against Saint Dane, not only for one last territory, but for all of Halla. Every secret is at last revealed, the truth uncovered But, is Bobby Pendragon ready to fight Saint Dane for everything that matters most in order to save all that was, is, and ever will be?