Thousands of years in the future, Earth is entirely covered by enormous skyscrapers that are tens of miles tall and extend miles beneath the surface. There's not a bare spot of ground that isn't covered with blacktop or occupied by one of these "megascrapers." Hundreds of billions of people spend their lives entirely within these monsters of technology, living, working, shopping, relaxing... Rare is the individual who ventures onto the roofs, or even...