Lauren Olamina and her family live in one of the only safe neighbourhoods remaining on the outskirts of Los Angeles. Behind the walls of their defended enclave, Lauren's father, a preacher, and a handful of other citizens try to salvage what remains of a culture that has been destroyed by drugs, disease, war, and chronic water shortages. While her father tries to lead people on the righteous path, Lauren struggles with hyperempathy, a condition that makes her extraordinarily sensitive to the pain of others. When fire destroys their compound, Lauren's family is killed and she is forced out into a world that is fraught with danger. With a handful of other refugees, Lauren must make her way north to safety, along the way conceiving a revolutionary idea that may mean salvation for all mankind