[This is the Audiobook CD Library Edition in vinyl case.] **Best Novel 1970 Nebula Award **Best Novel 1971 Hugo Award **Locus Award Winner [Read by Tom Parker - aka - Grover Gardner] The artifact is a vast circular ribbon of matter, some 180 million miles across, with a sun at its center. Pierson's puppeteers--strange, three-legged, two-headed aliens--discovered this ''Ringworld'' in a hitherto unexplored part of the galaxy. Curious about the immense structure, but frightened by the prospect of meeting the builders, they set about assembling a team to explore it: -Louis Wu, human -- old and bored with having lived too fully for too many years, seeking an adventure, and all too capable of handling it. -Nessus, puppeteer -- a trembling coward from a species with an inbuilt survival pattern of nonviolence.