12-year-old Nick Campbell and his 14-year-old sister Lisa discover a mysterious crystal-lined cave called the Cave of Myths. This place becomes the magical gateway to an incredible and spectacular journey, which takes the curious and enterprising brothers to leap from one epic myth and one legend to the other. And the two young Campbells don't even have time for the sibling rivalries as they have to fight dragons, save victims from diabolical warlords and meet countless historical characters from around the world. When Nick is mistaken for a world-renowned Dragonseeker, he doesn't play weak in hopes of a handsome reward. However, a terrible dragon threatens the kingdom and Nick is forced to face it. Fortunately, Saint George, the real Dragonseeker arrives in time and together they defeat the monster.