Buried amongst the treasures in Professor Brownstone's vault, lies a humble collection of books. Filled with legendary stories from his ancestors, they tell of fearless fighters and unlikely heroes. Join Luna, the most devious Brownstone, as she journeys to the palace of the Aztecs rain god Tlaloc, hunting for treasures. But will this thief learn that some things are more important than even the greatest riches?

Thrust into leadership upon the death of his emperor father, young Prince Ahkin feels completely unready for his new position. Though his royal blood controls the power of the sun, he's now responsible for the lives of all the Chicome people. And despite all of Ahkin's efforts, the sun is fading--and the end of the world may be at hand. For Mayana, the only daughter of the Chicome family whose blood controls the power of water, the old emperor's death...