A return voyage to the astonishing world of Larry Niven's Ringworld, with even more remarkable adventures and surprises, and a solution to that tantalizing question left from the earlier book: how was Ringworld built and by whom? It's been twenty years since the quixotic and worldsweary Louis Wu discovered the Ringworld. Now he and Speaker-To-Animals are going back, captives of the Hindmost, a deposed puppeteer leader. With Louis' help, the Hindmost intends to regain his status by bringing back such extraordinary treasures from the Ringworld that his fellow puppeteers will have to be impressed. But when they arrive, Louis discovers that the Ringworld is no longer stable . . . and will destroy itself within months. To survive he must locate the control center of the legendary engineers who built the planet. His quest becomes a wild and gripping venture, blended with the mysteries and spectacular technologies that only Larry Niven can conjure Praise for Ringworld Engineers"For new readers, there's fascinating adventure in plenitude. For old fans of Niven's Known Space series, or of the original volume, there are all the fine, characteristic touches that delight us Niven fans, and which support his reputation for uncommon wittiness and fast narrative pace."--Chicago Sun-Times"The Ringworld Engineers has all the imaginativeness, convincing detail, and narrative vivacity that have come to be associated with the works of Larry Niven. Furthermore, it answers a lot of questions that have been tantalizing his readers for a long time. Most highly recommended "--Paul Anderson