In a world where the supernatural lurks beneath the surface, AGON, a global covert agency, keeps the balance between humans and the creatures of myth. Their newest recruit? Feiyan Zhang, a jiangshi—an undead enforcer with a hunger for lifeforce and a past she has yet to fully come to terms with. Powerful, efficient, and feared even among her own kind, Fei struggles with the fine line between being a weapon and a person. Along with her mentor Finn MacCool, they take on missions few can handle.