Lately Nizhoni has been able to detect monsters, like Mr. Charles, her dad's new boss at the oil and gas company. He's also alarmingly interested in Nizhoni and her brother, Mac, their Navajo heritage, and the legend of the Hero Twins. Nizhoni knows he's a threat, but her father won't believe her. When Dad disappears the next day, leaving behind a message that says 'Run!', the siblings and Nizhoni's best friend, Davery, are thrust into a rescue mission that can only be accomplished with the help of Dine Holy People and their weapons. But it will take more than weapons for Nizhoni to become the hero she was destined to be...