In the latest action-packed installment of this New York Times bestselling series, Drake must help free the brilliant Crystal Dragon!Griffith is in trouble! Drake and Rori travel to Greenshire to find him. They meet a boy named Llew who show them the Crystal Cave where Griffith was last seen. Once inside, they are attacked by Belydor, a Crystal Dragon who does not trust humans. Can Llew help the Dragon Masters gain the dragon's trust and save Griffith?