Ringworld Engineers

Ringworld: the most stunning artifact in known space, an articficial world with three million times Earth`s surface area. Who built it? And where are they? In this stunning sequel to Larry Niven`s Hugo and Nebula award-winning novel, Louis Wu (now a near-hopeless lirehead hooked on electrical ecstasy), the aged Kzin warrior, Speaker-to-Animals, and the Hindmost, puppeteer mate of mad Nessus, return to Ringworld. Their aim is to prevent cataclysm. IN the process, they find themselves learning Ringworld`s incredible secrets...