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 threat it poses to humanity. As scientists and politicians grapple with the implications of this contact, a complex web of intrigue and mystery unfolds. The Three-Body Problem is a thought-provoking and scientifically grounded exploration of alien mysteries and the fate of humanity.