Destroyer of Worlds
The third book in the trilogy, set two hundred years before the discovery of Ringworld
Worlds closer to the galatic core than Known Space are — or were — home to intelligent species. 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 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.
Larry Niven
Larry Niven (Laurence van Cott Niven) is an American science fiction author. He was born 1938. His best known novel is Ringworld (1970), which received Hugo, Locus, Ditmar and Nebula awards.
Ringworld
Ringworld consists of four primary books, and includes six additional books that complement the series but are not considered mandatory reads. The current recommended reading order for the series is provided below.
Main series Tales of Known Space