The Three-Body Problem is a science fiction novel written by Liu Cixin. The story is set in China during the Cultural Revolution and follows a group of scientists who discover that Earth is under threat from an alien civilization. As humanity prepares for an inevitable invasion, the novel explores the moral and philosophical implications of contact with an advanced extraterrestrial species. The Three-Body Problem is a thought-provoking and intellectually challenging adventure that delves into themes of science, politics, and the nature of humanity's place in the universe.