In a world gripped by the Gloom-tide, the sun is a dying ember. Y/N, a nineteen-year-old scavenger, discovers she carries the forbidden Sun-Fire after a lifetime of hiding in the ruins. Branded a heretic, she is captured by Prince Kylon, the Citadel’s cold commander. Despite their hatred, they are bound by The Dyad—an ancient, physical tether between their souls. As the dark deepens, they must choose to destroy each other or become the light the world has lost.