Special police officer Lu Xiaoqi travels through the Song Dynasty and serves as the "Cruel Case Envoy" of the Divine Detective Division. He holds the Black Iron Order given by the emperor and is responsible for mysterious and mysterious cases that have not been solved for hundreds of years. Each case has ten chapters, and nine cases are connected in a series. Each case is independent, but each case hides a "secret line" - a certain mastermind behind the scenes uses nine strange cases as a chess piece to lead Lu Xiaoqi step by step into the Shura field. Each of the three beauties has their own unique skills: Su Yu'e is good at toxicology and medicine, Zhu Yin Yin knows the news and disguises herself, and Pei Yun is unparalleled in holding swords. In every case, there must be three people accompanying them, either to help or as a variable.
