Two teenagers from opposite worlds must fight their way through a vast walled quarantine zone in a dystopian America toward their only chance for survival. Seventeen-year-old Maisie Rojas has spent her entire life in the Q—a post-pandemic quarantine zone that was once Austin, Texas. Born and raised behind the high security walls that sealed their fate, she's now a trusted lieutenant for one of the territory's controlling families. Lennon Pierce, the charismatic son of a US presidential candidate, has just been kidnapped by his father's enemies and dropped out of a plane into the Q with nothing but a parachute strapped to his back. Lennon is given a temporary antidote to the disease and crucial intel for his father, but Maisie must get him out of the zone within forty-eight hours--or he will be permanently infected and forced to remain. With unrest brewing both inside and outside the Q, reaching the exit is a daunting and dangerous task. But if Maisie and Lennon fail, it could mean disaster for the entire quarantine zone and its inhabitants—and could cost Lennon his life.