Changeling

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"When an evil faerie steals Yanni's baby sister and swaps her for a changeling, Yanni is swept into a dangerous race against time to get her back. But faeries delight in tricks and rescuing her won't be easy. With the help of his cousin, Amy, and the reluctant changeling, Yanni must travel to goblin palaces and battle-swept oceans, discovering ancient treasures and secrets along the way. Yanni will need every drop of courage and even a few tricks of his own, if he's to outwit the faerie and save his sister"--Publisher's description