Twelve-year-old Katie didn't expect much from a summer at her grandfather's creepy old mansion-certainly not strange voices echoing up the fireplace or magical scrolls that open portals to another world. But when her grandfather vanishes, Katie discovers a hidden realm called O'Mirra¿ and a mission she can't ignore. With her cautious younger sister, Jenny, and an impulsive apprentice wizard named Aiden, Katie must cross cursed swamps and outsmart deformed, magical creatures to bring her grandfather home. Along the way, she uncovers her own buried magical powers, and the truth about her family's legacy. But time is running out. A shadowy force known only as Diabolus has taken hold of Madgar, a bitter would-be king bent on ruling O'Mirra. To stop him, and save her grandfather, Katie must summon not only her courage, but confidence in the magic that's growing inside her. A fast-paced, heartfelt fantasy adventure full of mystery, danger, and the power of believing in yourself-perfect for fans of Amari and the Night Brothers, Nevermoor, Fablehaven, and Harry Potter.