In 2187, strange disappearances occurred one after another in human interstellar colonies. Maintenance engineer Cheng Xing accidentally activated the "Watcher", the core of mechanical civilization that had been dormant for 200,000 years, while working on the space station, and became the only human being who could understand its quantum language. As the Watchers reveal the shocking truth about the origin of the two civilizations, Cheng Xing discovers that behind his ordinary life experience lies the key genetic code that can change the outcome of the war.
