With round-the-clock drugs, games, and eros parlors to entertain them and virtual weather to sustain them, humans live inside a global network of domed cities known collectively as "the Enclosure." Having poisoned the biosphere, we've had to close ourselves off from the Earth. The cities of the Enclosure are scattered around the globe on the land and sea, and are connected by a web of travel tubes, so no one needs to risk exposure. Health Patrollers...