Slated for execution, shapeshifting assassin, Dahlia Nite, flees her world to hide in the human realm. As payment for the shelter they unknowingly provide, Dahlia dedicates herself to protecting humans from what truly lives in the shadows.
When a series of brutal murders that defy explanation strike Sentinel City, Dahlia investigates the crimes. But with each new murder, the secrets that have kept humanity in the dark for centuries are in danger of being exposed. Light is shed on what should never be seen—and the little bit of peace she has found in this world begins to crumble.