In a post-apocalyptic world where a deadly virus has consumed a majority of the population, an enigmatic species known as animal "hybrids" have mysteriously began appearing around the earth. Although these hybrid's origins are unknown, they've been hunted relentlessly as their blood is the only cure for the virus. Isolated off in mountains resides Adwin and his father. Adwin only knows three things for sure: he is the last of his kind, humans are bad, and to never leave the wall that encircles his home. Three things that Desmond, the merciless hybrid huntsman, will come to understand.