In the second book in this page-turning series, Tag, Skyla, and Blaze journey to the Crystal Caverns. They are searching for a piece of the magical Ember Stone. But they do not know exactly where it is, and they are not the only ones searching for it . . . The powerful vulture Thorn is also after the stone -- and after Blaze! Thorn's dark magic is quickly spreading across Perodia, so the friends must move fast to reach the stone!