Xia Zhitong is an innocent young man who works in a second-hand bookstore after graduating from college. One night, he accidentally dug out a wordless ancient book. His finger was cut on the page, and blood seeped into the paper. A strange line of text suddenly appeared in the ancient book: "The contract is completed, and you can get a glimpse of the spirit." He has since acquired a golden finger - he can see supernatural traces that ordinary people cannot detect, and can deduce the cause and effect of supernatural events through "spiritual calculations".
However, this ability is not unique to him. On the dark side of the supernatural world, there is a group of "contractors" who are all competitors, hunting each other and robbing each other of their "spiritual computing power." Xia Zhitong was forced to get involved in this cruel game. He has no companions and no one can be trusted. Everyone who comes close to him may be behind his back. He can only rely on his pure intuition and careful wits to survive alone in many conspiracies, and step by step he uncovers the shocking secrets behind the ancient books.
