Upon returning to Shanghai, socialite Su Wenli visits an old friend whose husband is later found dead; after the death is ruled a homicide, Su Wenli suspects the victim was poisoned.

After her friend suspects that the servants, Taozi and Li Qiaomei, killed her husband, Su Wenli's investigation leads her to an unlikely location where the real killer is waiting.

After establishing her own detective agency, Su Wenli sets off to Nanjing with Taozi and ends up on a night-time hunt when a passenger disappears.

When the deceased passenger's jewellery 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.

After the police find the murder weapon in the nightclub singer's dressing room, Su Wenli goes to her friend's house for answers and uncovers a shocking secret.