1934, Shanghai.
At midnight, there were only a few dim street lights swaying faintly on the quiet streets. The city is in the midst of turbulence and change, with the atmosphere of modernity and the shadow of the past intertwined in every corner. Shanghai at night carries an indescribable sense of mystery, like a mystery hanging in the sky, waiting for someone to solve it.
Yang Songming stood in front of a low-key detective agency, looking at the black wooden door. The door was slightly open, a beam of light shined through the crack, and the air was filled with the smell of cigarettes and mint. He was the only one in the office, behind him were bookshelves filled with old clocks and pornographic files. Yang Songming, a well-known detective in Shanghai, has solved countless suspense cases with his intelligence, tenacity and extraordinary reasoning ability. However, all this is just an accidental beginning - he is also facing a brand new challenge.
"Song Ming, tonight, your wisdom will be tested again."
This sentence comes from his old friend, Shen Zhongwen, a former forensic expert who has now become Yang Songming's most trusted friend. Shen Zhongwen left a letter to Yang Songming, which mentioned a new case. There seemed to be a greater conspiracy behind the case. Although Yang Songming had no warning, he clearly knew that this would be the most complicated case in his career.
