Five years ago, Lin Xuan's grandfather, heir to a family of traditional Chinese medicine practitioners, died under mysterious circumstances. The final page of the family's secret manual for the Thirteen Needles of the Ghost Gate vanished without a trace, leaving him with only an old bronze needle engraved with the words "Ghost Gate."
Five years later, Lin Xuan has become an ordinary forensic examiner. While assisting the police with a series of bizarre death investigations, he discovers that every victim has a strange pinprick on their body, undetectable even with a silver needle. The method points to the long-lost Ghost Gate Needle Technique.
