As the inhabitants of the island of Mistmantle prepare for the coronation of Crispin the squirrel, robes are stitched, cakes are baked, wine is brought up from cellars, and the Heartstone—the unique gold-and-silver-flecked stone that only the rightful ruler of the island can hold—is readied. But the newly established peace in Mistmantle is soon under threat. Urchin finds himself journeying to a hostile island, where he will have to face challenges greater than those her has ever known . . . and he will learn a secret about his past that will change his life forever.