"The Three-Body Problem" is a science fiction novel written by the Chinese author Liu Cixin. It is the first book in the "Remembrance of Earth's Past" trilogy. The story is set in China's Cultural Revolution period and follows Ye Wenjie, who witnesses her father's scientific beliefs leading to his death.

She is subsequently recruited into a secret military project to establish contact with extraterrestrial life. Decades later, Wang Miao, a researcher in nanomaterials, becomes involved in a mysterious virtual reality game called "Three-Body." He discovers a connection between the game and a series of unexplained deaths among scientists. The novel explores themes of science, technology, and the consequences of contact with an alien civilization.