The first thing you need to know about this city is that it is big. It is difficult to explain to someone who has never seen it. You can fold his town into a corner of one of the city's five separate sectors and still have room for more. The next thing you need to know is that it's dangerous. Never mind the reassuring bulletins from the mayor's office; just watch the first ten minutes of the eleven o'clock news and you'll learn exactly what the people...