The Three-Body Problem is a critically acclaimed space thriller mystery book written by Liu Cixin. It is the first book in the Remembrance of Earth's Past trilogy. The story combines elements of science fiction, mystery, and philosophy as it follows a group of scientists who uncover a secret alien invasion plot. With its intricate plot, mind-bending concepts, and exploration of humanity's place in the universe, The Three-Body Problem is a must-read for fans of space thrillers and mysteries.