Maximiliano Córdoba loves stories, especially the legend Buelo tells him about a mythical gatekeeper who can guide brave travelers on a journey into tomorrow.If Max could see tomorrow, he would know if he'd make Santa Maria's celebrated fútbol team and whether he'd ever meet his mother, who disappeared when he was a baby. He longs to know more about her, but Papá won't talk. So when Max uncovers a buried family secret--involving an underground network of guardians who lead people fleeing a neighboring country to safety--he decides to seek answers on his own.With a treasured compass, a mysterious stone rubbing, and Buelo's legend as his only guides, he sets out on a perilous quest to discover if he is true of heart and what the future holds.