In Maddison's last visit to the ancient city, she encountered a man. More surprising was what he lacked on his face.... He wore no mask. A hundred years since the Great Disaster and he not only lived beyond infancy, but he breathed the air. No one breathed free air anymore at the risk of dying cancerous and crazed. Nothing of value is free-not the water, not the land, not the food... ...and certainly not the air.