The Three-Body Problem is a science fiction novel by Liu Cixin. Set against the backdrop of China's Cultural Revolution, the story follows a group of scientists who discover that Earth is under threat from an alien civilization. As humanity grapples with the impending invasion, the book explores themes of physics, philosophy, and the nature of civilization. The Three-Body Problem is a thought-provoking and intellectually stimulating read, blending hard science fiction with political intrigue and cosmic mysteries.