Shadows are their own race of beings, each having a human counterpart who lives in the world of light. A thousand generations ago, they were exiled from the Surface world due to a curse borne of human hate. Now Nyx (or "Nick"), a shade and descendent of the one who cast the curse, must infiltrate the human race in preparation for the shadow beings' great revenge. This is Nick's mission: exterminate the human race. Starting with Nick's own counterpart, Lily. The only problem is, Nick's heart isn't really in the mission. Because, it turns out, Lily is super hot.