The Three-Body Problem (Liu Cixin) Books in Order

Remembrance of Earth's Past, often called the Three-Body trilogy, begins with The Three-Body Problem and stretches from the Chinese Cultural Revolution into the far future, following humanity's first contact with the embattled alien civilization of Trisolaris.

In the opening novel, astrophysicist Ye Wenjie is recruited to a secluded military base after seeing her father killed in a struggle session. There she secretly beams a message into space, setting in motion an invasion plan and a clandestine Earth-Trisolaris Organization that recruits sympathizers through a strange, brutally difficult virtual reality game.

The Dark Forest jumps forward to a world that now knows an alien fleet is four centuries away, while Earth's science has been crippled by Trisolaran "sophons" that can spy on every experiment and conversation. The United Nations responds with the Wallfacer Project, handing four very different strategists near unlimited resources to devise plans known only to themselves, even as Trisolaris counters with relentless Wallbreakers.

Reluctant sociologist Luo Ji, the most unlikely Wallfacer, slowly pieces together a theory of "cosmic sociology" and a universe that behaves like a dark forest, where any civilization that reveals itself risks instant annihilation. His eventual deterrence strategy reshapes relations between Earth and Trisolaris and casts a long shadow over everything that follows.

Death's End widens the lens again through aerospace engineer Cheng Xin, who inherits responsibility for that deterrent in eras when technology, politics and even the laws of physics keep shifting. The final volume moves from solar system diplomacy to truly cosmic warfare, asking how much any individual life can matter in a universe that treats civilizations as pieces on a vast strategic board.

Across the trilogy you can expect long time jumps, audacious scientific set pieces and big moral questions rather than intimate domestic drama. Liu leans on concepts such as dimensional warfare, quantum surveillance and planet scale engineering, but he always ties them back to recognizable human choices under extreme pressure.

For new readers, the best path is simply to read the three core books in order, starting with The Three-Body Problem. You can dip into related works like Ball Lightning later if you want more background on side characters and technologies that echo through the trilogy.