When a mission in NEW YORK goes terribly wrong, Sienna Nealon finds herself replaced as head of the government agency responsible for policing people who have powers beyond those of a normal human. Marginalized, humiliated, she ponders her place in the world given that her battle is over. But it isn’t a long time before another threat rears its awful head, and Sienna finds herself outmatched and outgunned-against previous prisoners bent on executing a scheme that will push Sienna past limitations of ruthlessness also she cannot imagine.