Bill G. Butler 
Wizard Quest and The Temple of Grace [EPUB ebook] 

Boden, Bethany, Navek and Henna are wizards who have chosen a life of adventures. In their coming of age, they set forth into Tream Heartaya a place of wonder and art. They travel into the wild between castle towns which sit in their own worlds. Outside is dangerous, but inside is safe. On their way, they explore the worlds outside the walls and arrive at new towns and make new friends. As they go, a magical trouble is brewing, and they have to decide if they are strong enough to help out in handling the problems that come from it.