Cusp
by Robert A. Metzger

Description:
In 2031, the world changes forever. A solar flare of incalculable power actually shifts the position of the Sun, while at the same time two immense walls, kilometers high and wide erupt out of the Earth and circle it in two directions like a pair of rings - one follows the Equator, while the other runs pole to pole. The climatic and geographical chaos topples governments, pushes civilization to the brink of destruction, and brings about a new world order. Decades later, a fractured human race struggles to regain control of the planet and the Rings that straddle it. There is even talk of deliberately trying to reignite the solar flare. But as one faction vies with another for power, all of the really important decisions are being made elsewhere. An enigmatic entity has its own plan for human evolution, using the supercomputer known as CUSP - the first computer designed to run on the software of the human mind.