The Grand Dragon Masters are the keepers and guards of a large red diamond in the shape of a heart. Known as the Heart of Fire, the red diamond sits atop a throne in a temple surrounded by stone replicas of Dragon Masters from since the beginning of time. The little dragons are forbidden at a very young age from going to the Temple. A real danger of encountering and being captured by evil Dragon Slayers—always trying to steal the invaluable Heart of Fire—exists. When Max, Gus, and Thor ignore their parents' instructions to stay away from the Temple, they encounter Beaudolf and Tristan, Dragon Slayers who are on a quest to avenge their father's death. There are lessons learned by everyone about the consequences of the choices they make.