Best-selling author Rick Riordan welcomes indigenous fantasy writer Rebecca Roanhorse to his imprint with this thrilling adventure about a Navajo girl who discovers she's a monsterslayer. Lately, seventh grader Nizhoni Begay has been able to detect monsters, like that man in the fancy suit who was in the bleachers at her basketball game. Turns out he's Mr. Charles, her dad's new boss at the oil and gas company, and he's alarmingly interested in Nizhoni and her brother, Mac, their Navajo heritage, and the legend of the Hero Twins. 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, which can only be done with the help of Navajo gods, all disguised as quirky "rez" personalities. After a series of dangerous—and mind-bending—trials, Nizhoni, Mac, and Davery finally reach the sun god, who outfits them with the weapons they need to take down Mr. Charles and the ancient monsters he has unleashed. But it will take more than weapons for Nizhoni to become the hero she was destined to be. . . .