When a mysterious heirloom resurfaces, Andy Kessler's quiet life in the supernatural town of Hudsonville is shattered. His adoptive sister is kidnapped, his father left for dead, and a forgotten war reignites beneath their feet. To save the people he loves, Andy must descend into a vast underground world teeming with ancient cities, monstrous creatures, and a power that demands memories as payment. But the deeper he goes, the more he loses-of his past, his identity, and his humanity. With a ragtag band of allies and a dangerous artifact in hand, Andy must confront the monster within and the enemies above. Because some promises are worth breaking, and some monsters are worth becoming. A gripping young adult urban fantasy about memory, sacrifice, and the cost of becoming a hero.