The story takes place in Linjiang City in the 25th year of the Republic of China. This city built on the river has become a business hub due to its developed waterways, but it also hides the secrets of three religions and nine streams. The largest chamber of commerce in the city, "Tongdetang", has been entrenched for hundreds of years, and its properties are spread across docks, banks, and silk shops. However, in the past ten years, it has encountered strange incidents one after another - its presidents have died mysteriously, and the causes of death are all pointed to "accidents." However, a bronze token with the word "Hui" engraved on it appears at the scene. What's even more bizarre is that each crime happened on a rainy night, and before his death, the deceased had visited the "corridor courtyard" deep in the old Tongdetang house that was locked all year round.
