Worlds closer to the galatic core than Known Space are --or were-- home to intelligent speciers. Some learned of the core explosion in time to flee. Destroyer of Worlds opens in 2670, ten years after Juggler of Worlds closes; with refugee species fleeing in an armada of ramscoops in the direction of the Fleet of Worlds. The onrushing aliens are recognized as a threat; they have left in their trail a host of desolated worlds: some raided for supplies, some attacked to eliminate competition, and some for pure xenophobia.

Only the Puppeteers might have the resources to confront this threat--but the Puppeteers are philosophical cowards... they don't confront anyone. They need sepoys to investigate the situation and take action for them. The source of the sepoys? Their newly independent former slave world, New Terra.

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From Publishers Weekly

Fleeing a massive explosion at the galactic core, a human colony and their allies, the alien Puppeteers, discover they are not the only ones desperate to outrace destruction in the third prequel to Niven's Ringworld saga (after 2008's Juggler of Worlds). Thssthfok, a ruthless Pak, will do anything to safeguard his clan after Pakhome is destroyed. Paranoid human agent Sigmund Ausfaller and Puppeteer Baedeker are sent to investigate a distress call from the Gw'oth, who have detected a suspicious ship headed toward the Fleet. Sigmund agrees to work with the Gw'oth, but he's concerned that their insatiable drive for scientific development may make them an even bigger threat than the Pak. With the authors working hard to knit together backstory, this one is primarily for fans of Niven's Known Space setting who will enjoy seeing past puzzles made clear. (Nov.)
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Review

“Wide screen galactic scope, nifty super-science, crafty aliens, corporate corruption and cover ups, and a multi-leveled spy vs. spy vs. spy mystery with little being as it first appears make Juggler of Worlds a first class examplar of pure SF entertainment.” ―SFSite on Juggler of Worlds