"The Expanse" is a science fiction novel series written by James S.A. Corey, the pen name of authors Daniel Abraham and Ty Franck. The series begins with the first book, "Leviathan Wakes," published in 2011, and explores a future where humanity has colonized the solar system. The story follows a diverse cast of characters, including a detective, a spaceship crew, and a politician, as they navigate political tensions and uncover a mysterious alien technology. The series is known for its realistic portrayal of space travel and its complex world-building, which includes factions like the United Nations, Mars, and the Belters. Over the course of nine novels, the narrative delves into themes of survival, power struggles, and the consequences of human actions in a vast universe. The series has also been adapted into a successful television show, further expanding its reach and popularity.