Fleet of Worlds

A five-book sequence by Larry Niven and Edward M. Lerner set in Niven's Known Space universe. The first four novels — Fleet of Worlds, Juggler of Worlds, Destroyer of Worlds and Betrayer of Worlds — serve as prequels to Ringworld, following the secretive, cowardly Puppeteers and their fleet of worlds; the fifth, Fate of Worlds, is a direct sequel to the Ringworld novels. Published 2007–2012 and complete at five books.