"The Prefect" is a science fiction novel by Alastair Reynolds, set in the Revelation Space universe. It follows the story of Tom Dreyfus, a law enforcement officer known as a Prefect, who is tasked with maintaining order in the Ultra system. The narrative explores themes of governance, technology, and the complexities of human behavior. The plot centers around a mysterious threat that endangers the stability of the system. As Dreyfus investigates, he uncovers deeper conspiracies and challenges that test his beliefs and abilities. The novel combines elements of mystery and adventure, showcasing Reynolds' signature blend of hard science fiction and intricate world-building.