The Skull of the World: Witches of Eileanan #5

In the land of Eileanan, the Pact of Peace has not meant the end of unrest. And, though Isabeau would like to return home to help her family in these uncertain times, she must first venture to the Skull of the World where she will discover her true talents as a witch. And when she does return home, she does so transformed with the power to overcome her family's enemies once and for all.