For twenty years, Iona has lived quietly in a world where magic is tightly controlled and out of her reach. But when a chance encounter with an ancient artifact awakens a rare and volatile ability to amplify the enchantments of others, Iona becomes a hunted fugitive of the Aethelguard, the powerful regulators who maintain a centuries-old monopoly on magic. Forced to flee into the unmoving fog of Shadowfen, she must train under a disillusioned mentor to master her gift before the organization that polices the "truth" can silence her forever. As Iona uncovers the dark history of the seals that limit humanity's potential, she realizes her survival is tied to a much older mystery, one that threatens to unleash an ancient, hungry presence the world's keepers are no longer prepared for.