Mage Fire

Mage Fire is the third and final book in the Faelin Chronicles YA fantasy trilogy about a twin boy and girl, the children of a Fae mother and a human father, who discover a new destiny after their parents are murdered. They learn that their parents' cautious ways hid a lifetime of secrets, including Eirian, a magical sword that was buried on their farm. Their little sister has been taken by someone who wants that sword and the ultimate power that comes with it. The twins-along with their friends, a goblin boy and a talking wolf pup-have to find their sister and the truth about their parents' mysterious past.