From the #1 internationally bestselling author of How to Train Your Dragon and Wizards of Once comes an out-of-this-world adventure where magic and reality collide K2 O'Hero is a seemingly ordinary boy--after all, he and his twin sister, Izzabird, have been sworn to keep their family's Magical history a secret. Not even their infuriating stepsiblings, Theo and Mabel, know that Magic exists. They believe K2 to be the most...