The Three-Body Problem is a science fiction novel written by Liu Cixin. It is the first book in the Remembrance of Earth's Past trilogy. The story revolves around the discovery of an alien civilization and the subsequent diplomatic relations between humans and aliens. The book explores themes of physics, philosophy, and the nature of humanity. With its intricate plot and thought-provoking ideas, The Three-Body Problem has gained critical acclaim and won numerous awards, including the Hugo Award for Best Novel. It is a must-read for fans of science fiction and those interested in exploring the possibilities of alien contact.