The novel, co-written by Niven and Edward M. Lerner, was released in 2007 and nominated for a Prometheus Award. It is set shortly after the events of the short story "At the Core". The novel concerns the liberation of New Terra from the Concordance of the Pierson's Puppeteers. It also introduces a new intelligent species to Known Space, the Gw'oth.
The Fleet of World series consists of five books by the same authors:
- Fleet of Worlds (2007),
- Juggler of Worlds (2008),
- Destroyer of Worlds (2009),
- Betrayer of Worlds (2010), and
- Fate of Worlds: Return from the Ringworld (2012).
Thus, the Fleet of Worlds series consists of four prequels to, and one sequel to, Ringworld.