When the murder of a woman is reported to the Shanghai police while Inspector Chen is on vacation, Sergeant Yu is forced to take charge of the investigation. The victim, Yin Lige, a novelist known for her banned book, has been found dead in her tiny, humble room off the stairwell of a converted multi-family house. It seems that only a neighbor could have committed the crime, for the building is kept locked at night. But there is no apparent motive....
