The Roar, by Emma ClaytonRead about the other entries on the list.
Clayton’s debut book for young readers is set in a future where the world’s population has retreated behind a huge wall after a plague turns every animal into a vicious predator. A poisonous agent has been introduced outside the wall to kill everything, while urban sprawl on the other side has made the world into one enormous city, overcrowded and unhappy. As Clayton’s main character, Mika, investigates his sister’s disappearance, he begins to suspect that the people haven’t been told everything. What sets Clayton’s sprawl apart is the sense of claustrophobia, as most of the population lives in crowded, flooded slums—and any attempt at finding some space means running up against the monolithic wall.