Callie, a not-quite-human high school student, can see and speak to creatures invisible to others. Her father, a demon, runs a magical antique shop. On Callie's seventeenth birthday, her father disappears and she must enter the magical realm to find him. She is joined by a boy named Declan--who also can see invisible creatures--and a ghostly Radish. The unlikely heroes encounter medieval villages, enchanted forests, and talking trees in their quest to find Callie's father.
