Already battling a fatal disease, Kassia Madison somehow survives an apocalyptic red mist. Only a tiny percentage of people are immune to the mist--but not all of them are human.
Alone, Kassia searches for her family in a dying New York filled with extraordinary dangers. After she meets a dynamic resistance leader fighting for humanity's future, she faces a devastating choice.
Meanwhile, in the shadows, someone not fully human has taken a special interest in Kassia. Raised as an emotionless Outrider, this hybrid records the destruction of civilization in New York. As he coolly observes Kassia's desperation and courage, he decides to turn her struggle to stay alive into a scientific experiment.
Elsewhere, the other hybrid Outriders are already planning their next move. Brutal and relentless, they are intent on eradicating the remaining human survivors ... including Kassia.