In Shanghai in 1931, it was dark at night, and neon lights decorated the Huangpu River like a dream. The wharf is filled with the salty river breeze, and the streets are filled with the sounds of people and the hustle and bustle of carriages and horses. In this bustling city, everyone wears a mask, and behind it may be a secret or a sin.
The protagonist Lin Zhengyan, a young detective working in the concession detective agency, is an "alien" in this city. He always wears a slightly outdated suit, has cold eyes and acts calmly. This thin man who came to Shanghai from the north doesn't like to talk much, but once he speaks, he hits people's hearts. Lin Zhengyan has a nickname in the police community - "Dream Interpreter". He said that crime is like a dream, and the truth is the first glimmer of light when you wake up from the dream.
Lin Zhengyan's office is located in a quiet alley in the French Concession. That night, he had just finished sorting out an inheritance dispute case at hand and was about to drink a cup of tea and relax for a while when there was a rapid knock on the door.
