Juggler of Worlds by Larry Niven and Edward Lerner is set in Niven's Known Space universe, 200 years before the discovery of the Ringworld. The story follows ARM agent Sigmund Ausfaller as he uncovers secrets and conspiracies involving the manipulative alien Puppeteers. Through various timelines and perspectives, the novel reveals the Puppeteers' intricate schemes affecting human and alien civilizations. As Sigmund delves deeper, he faces ethical dilemmas and the vast implications of interstellar politics. The book enriches the backstory and expands on themes from the Ringworld series.