Though evidence points to the businessman's female servants, Taozi and Li Qiaomei, as the murderers, Su Wenli is determined to clear their names. Later, Su Wenli finds the real killer waiting for her in an unlikely location.

After Su Wenli establishes the Miss S Detective Agency and recruits Taozi as her new employee, the pair embark on a train to Nanjing. There, Su Wenli discovers a passenger has disappeared, propelling her on a night-time search that leads to a shocking discovery.

When the deceased passenger's jewelry is found with an orphan, the victim's daughter and nephew share family secrets.

After Su Wenli witnesses the sudden death of a gossip columnist at a nightclub, she uncovers his history of infidelity and blackmail.