The Silent Invasion, James Bradley’s first Young Adult novel and the first in a trilogy, begins in generic post-apocalyptic fashion. Humanity crowds into restricted safe zones, hiding from an intergalactic plague that infects living matter with the mysterious Change. Adolescent protagonist Callie’s younger sister Gracie is infected; to prevent her demise at the hands of Quarantine, Callie flees with her sister to the Zone, an area beyond Quarantine’s control in Australia’s far north that is overrun with Changed flora and fauna.