Eighteen-year-old Kiera Allison has always felt caught between two worlds: her family's deep-rooted magic in Fern Glade and the shadowy pull of something no one will name. Her coven recognizes her, but they don't understand the flickers of darkness in her spells or why sigils behave differently when she's near.

When a long-dormant sigil awakens under Kiera's hand, it sets off more than sparks. The veil between realms begins to fray, and no one can agree on what's bleeding through. Her aunts call it a coincidence. But Kiera knows better. Something is calling to her, and it's not done yet.

With help from her best friend Paige, fae-blooded, intuitive, and just as haunted, and Harvey, a quietly brilliant outsider with his late father's journal of magical patterns, Kiera begins to piece together what the coven won't say: her magic isn't broken. It's incomplete.

As shadow magic begins to twist through Fern Glade, warping spells and cracking old wards, Kiera faces a choice. She can suppress the half of herself no one taught her to wield, or she can embrace it and risk becoming the very thing her family fears.