Cixin Liu three body problem 4 books collection set (the three-body problem, the dark forest, death's end, the wandering earth)

The Three-Body Problem 1967:
Ye Wenjie witnesses Red Guards beat her father to death during China's Cultural Revolution. This singular event will shape not only the rest of her life but also the future of mankind.Four decades later, Beijing police ask nanotech engineer Wang Miao to infiltrate a secretive cabal of scientists after a spate of inexplicable suicides. Wang's investigation will lead him to a mysterious online game and immerse him in a virtual world ruled by the intractable and unpredicatable interaction of its three suns.

The Dark Forest (The Three-Body Problem)
Imagine the universe as a forest, patrolled by numberless and nameless predators. In this forest, stealth is survival any civilisation that reveals its location is prey.Earth has. Now the predators are coming.Crossing light years, they will reach Earth in four centuries' time. But the sophons, their extra-dimensional agents and saboteurs, are already here. Only the individual human mind remains immune to their influence.

Death's End (The Three-Body Problem)
Half a century after the Doomsday Battle, the uneasy balance of Dark Forest Deterrence keeps the Trisolaran invaders at bay. Earth enjoys unprecedented prosperity due to the infusion of Trisolaran knowledge. With human science advancing and the Trisolarans adopting Earth culture, it seems that the two civilizations can co-exist peacefully as equals without the terrible threat of mutually assured annihilation. But peace has also made humanity complacent.

The Wandering Earth
Half a century after the Doomsday Battle, the uneasy balance of Dark Forest Deterrence keeps the Trisolaran invaders at bay.Earth enjoys unprecedented prosperity due to the infusion of Trisolaran knowledge and, with human science advancing.