The conclusion of the brilliant trilogy by the Chinese sci-fi author, begun with "The Three-Body Problem." Half a century after the Battle of Doomsday and the end of the era of intimidation, the Trisolaran invaders are kept at bay. Earth enjoys prosperity thanks to the acquisition of alien knowledge. Human science evolves daily, while the Trisolarans adopt Earth culture. It seems that the two civilizations may soon coexist peacefully on equal terms without the terrible threat of mutual destruction. But such peace made humanity too complacent. Cheng Xin, a space engineer from the early 21st century, emerges from hibernation. She recalls a long-forgotten program dated to the beginning of the Trisolaran Crisis period, and her very existence may disrupt the fragile balance between the two civilizations. The world enters a new era—the Era of Sanctuaries. Humanity must unite and prepare for a possible apocalypse. This path will be full of astonishing achievements, victories, tragedies, stunning discoveries, and insights. Will humanity reach the stars or perish in its cradle? Winner of the Locus Award and finalist for the Hugo Award, a New York Times bestseller, one of the best books of the year according to Amazon, The Guardian, Tor.com, Kirkus Reviews, NPR, and B&N Sci-Fi & Fantasy Blog. "A war of the worlds for the 21st century... filled with a sense of wonder." — Wall Street Journal "The best science fiction." — Kim Stanley Robinson "A meditation on technology, progress, morality, extinction, and simultaneously a cosmological thriller." — NPR