Maya Kaathryn Bohnhoff 
Taco Del and the Fabled Tree of Destiny [EPUB ebook] 

The Kingdom of Embarcadero is under siege. King Elvis wants to steal its secrets, mysterious outsiders want to expel its citizens, an ancient and sinister Force threatens to devour their souls. Salvation rests on the slender shoulders of a young wizard named Taco Del and his unlikely allies – a red-haired Chinese girl, a ghosty tribe of Mission Indians and a small fir tree named Doug.