The Ringworld, with its vast resources and technology so advanced that no species has yet unravelled its secrets, has disappeared from Known Space. And no spacefaring species knows why -- or isn't saying. Lous Wu, Sigmund Ausfaller and other humans must contend with the ferocious Pak and the new spacefaring species the Gw'oth while trying to work with the devious Puppeteers to find and restore the Ringworld. Meanwhile, the Puppeteers, involved in their own internecene political struggles, must rely on a self-aware AI named Proteus to manage their own defenses. And Proteus is developing its own agenda... The fifth novel in the Niven/Lerner series that
Booklist praised for its "exceptional freshness and suspense...full of startling revelations about human and Puppeteer politics."

"Longtime Ringworld fans and current series devotees should be more than satisfied by Niven and Lerner’s signature hard-sf spin on the events in the climactic final chapters.”
- Booklist on FATE OF WORLDS

“Brings to a stunning close a multivolume saga that has captured the imaginations of a multitude of readers … a story that will attract attention from series fans as well as readers of hard sf.”
- Library Journal on FATE OF WORLDS

“A fantastic science fiction novel.”
- Layers of Thought on BETRAYER OF WORLDS

“Intelligent space opera, with a twinge of nostalgia for the 1970s.”
- Critical Mass (Don Dammassa reviews) on BETRAYER OF WORLDS

“Rescues, captures, kidnappings, reluctant temporary alliances, backdoor negotiations, propaganda campaigns, bluffs and double-bluffs, alien and cross-species politics, and, of course, betrayals. Lots of betrayals ... One hopes that Niven and Lerner come up with some additional twists and turns.” - Locus on BETRAYER OF WORLDS

“A welcomed addition to Larry Niven’s exploration and chronicles of Known Space.”
- San Francisco Book Review on BETRAYER OF WORLDS

“A powerful adventure and a ‘must’ addition to the Ringworld saga!”
- Midwest Book Review on BETRAYER OF WORLDS

“You’ll find plenty here to enjoy. There are bizarre aliens both old and new; there’s more advanced technology than you can shake a neutron star at; there are ideas to make your head spin.”
- Analog Science Fiction and Fact on DESTROYER OF WORLDS

"Fans of Niven's Known Space ...will enjoy seeing past puzzles made clear."
- Publishers Weekly on DESTROYER OF WORLDS

“Fun, fast, and full of ... remarkable aliens.”
- SFrevu on DESTROYER OF WORLDS

"A lively prequel to Niven's 1970 classic, RINGWORLD … Fans of hard SF will be well rewarded."
- Publishers Weekly on FLEET OF WORLDS

“A new Known Space book, particularly one with new information about Puppeteers and their doings behind the scenes of human history, needs recommending within the science fiction community about as much as a new Harry Potter novel does, well, anywhere. But Niven and Lerner have produced a novel that can stand on its own as well as part of the Known Space franchise.”
- Locus on FLEET OF WORLDS

"Exceptional freshness and suspense ... full of startling revelations about human and puppeteer politics."
- Booklist on FLEET OF WORLDS

“Niven and Lerner … clearly enjoy revisiting aliens familiar from Niven’s menagerie while spinning an elaborate tale of interplanetary intrigue. Their many fans will, too.”
- Booklist on JUGGLER OF WORLDS "Niven and Lerner...adroitly expand upon familiar ground … and, at the same time, pour it into an entirely new bottle."
- Starlog on JUGGLER OF WORLDS

Praise for Larry Niven:
"Great story-telling is still alive in science fiction because of Larry Niven, and his finest work is the Ringworld series."
- Orson Scott Card

"The premier hard SF writer"
- The Baltimore Sun

Praise for Edward M. Lerner:
"Lerner's world-building and extrapolating are top-notch."
- SFScope

LARRY NIVEN: www.larryniven.net
EDWARD M. LERNER: www.edwardmlerner.com