In 1932, in the French Concession in Shanghai, rain and fog wrapped around the bluestone road. A murder case in the secret room of an antique shop made Lu Jingyan, who had just been transferred from the branch to the criminal department of the headquarters, join forces again with Fu Yanci, a consultant with a Beiyang background. From the traces of wax in the fireplace to the blue and white jade pendant engraved with Nanyang symbols, clues are intertwined in the bizarre concession - the group photo hidden by the foreign businessman George, the murder cases that surfaced one after another, and the Nanyang merchant ship missing at the dock. Each mystery is like a fog wrapped in rain, vague and dangerous.
They are tacit detective partners. Lu Jingyan uses meticulousness to uncover the cracks in the details, and Fu Yanci uses experience to block the murderer's escape route. They are also lovers who are becoming more and more aware. In Chapter 9, Fu Yanci reveals his feelings with old feelings, and in Chapter 17, Lu Jingyan responds to his love in the teahouse. From working side by side when the branch investigates the case, to staying together when the headquarters is chasing the murderer, in the shady world of the French Concession, they must not only expose the lies and hunt down the real murderer, but also protect each other's sincerity, so that when the rain stops, the truth will illuminate every corner of the concession with the morning light.
The rain in the French Concession always likes to hide secrets - some in the cracks of the bluestone, and some in the hearts of the people.
Concept: Five people investigate the case, and their tacit understanding doubles!