Twenty years after his father disappeared, Lu Guanheng saw him again in a recently filmed video of an ancient tomb. His father looked no older than before, and left behind only one warning: “Don't let Dijun see your blood.” To uncover the truth, Lu Guanheng, heir to a declining family of practitioners of the Book of Changes, joined Ye Zhiwei, a traditional Chinese medicine researcher, He Changgeng, an heir to the Ting Shan sect, and Zhou Jiming, a former aerospace tracking and control engineer. Together, they ventured into the Corpse-Locking Well of Erfu, deep in the Qinling Mountains. They gradually discovered that the Book of Changes was no fortune-telling text, but an ancient formula for interpreting ley lines, mechanisms, the human body, and the stars. The gods and strange beasts in the Classic of Mountains and Seas were no mere legends, either. Twelve ruins, six core systems of the Book of Changes, and a path leading to the Ninth Heaven. So-called immortality simply meant replacing your body once it wore out. But Dijun, who had lived for thousands of years, no longer had a single piece of flesh that belonged to his original self. And he was waiting for Lu Guanheng not to pass on his throne, but to take possession of Lu Guanheng's body.