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. Cheng Xin, an aerospace engineer from the 21st century, awakens
from hibernation in this new age. She brings knowledge of a long-forgotten
program dating from the start of the Trisolar Crisis, and her presence may
upset the delicate balance between two worlds. Will humanity reach for the
stars or die in its cradle?