Half a piece of broken inkstone, a message, and everything happened overnight. In the eighth year of Kangxi's reign, the cloth merchant Shen Yan received half an ancestral inkstone from his brother-in-law, Su Jingran, the prefect of Qiupu. The jade inlay on the bottom of the inkstone was pried away, and the message was only six words: "Qiupu Black Wind Gate, come quickly if you encounter a robbery." That night, someone came to the door with a knife to ask for the inkstone.
What is hidden in the inkstone is not a treasure, but half a secret book, fatal evidence that is enough to shake up the Jiangnan officialdom. Going to Qiupu is a narrow escape. If you don't go, everyone in the Su family will be buried with you. But what awaits him in Qiupu City is one identity reversal after another: the life and death of the real magistrate is unknown, the fake magistrate sits in court to investigate the case, his cronies betray him in public, and there are hidden clues hidden in the dark. He took up the role of a peddler and embarked on this life-for-life investigation road alone. He saw through the fake prefect, uncovered the mastermind behind the scenes, and turned the Jiangnan officialdom into chaos. But Feng Chengzuo is just the one floating on the water. Under the water of Jiangnan officialdom, there is a hand codenamed "Crane" hidden under the water.