Ringworld's Children is a 2004 science fiction novel by American writer Larry Niven, the fourth in the Ringworld series set in the Known Space universe. It describes the continuing adventures of Louis Wu and companions on Ringworld. Plot summary The novel's plot is largely concerned with the so-called Fringe War. All the intelligent species of Known Space are interested in the Ringworld. In the novel, they engage in a Cold War of sorts (actually begun in the previous novel, The Ringworld Throne) on the fringe of the Ringworld star system. References 2004 American novels 2004 science fiction novels American science fiction novels Known Space stories Novels by Larry Niven Tor Books books Fiction set in the 29th century