Scholastic Inc. The Crystal Caverns: A Branches Book (the Last Firehawk #2): Volume 2

Tag, Skyla, and Blaze are headed to the Crystal Caverns in search of the next piece of the magical Ember Stone. But Thorn and his dark magic, The Shadow, are quickly spreading across Perodia. Thorn wants the powerful stone--and he wants the last firehawk, too! The friends will have to battle Thorn's spies to reach the stone. Will they find it in time?