After years of studying in Europe, Su Wenli returned to Shanghai from Paris. She attends a dinner hosted by a school friend whose husband dies mysteriously.
The servant, Taozi is suspected to have poisoned her master to death. Meanwhile, a male dancer who wishes to avenge his sister is also a suspect. But Su Wenli has someone else in mind.
On a night train, a wealthy woman enjoys her meal in the dining carriage, followed by her sudden disappearance in a locked cabin. Later, her body is discovered hanging on a water station beside the railway tracks.
The deceased had left a huge fortune behind. Who will inherit it? Who has been bearing a deep grudge against her? As these people are being investigated, the truth is slowly revealed.
In a lively and vibrant nightclub, a customer collapses and dies abruptly. The crime scene is cordoned off but a window in the washroom is open. A friend of Su Wenli has fled the scene.
The police find the murder weapon in the female nightclub singer's dressing room. The singer turned herself in but Su Wenli has a feeling that she is not the real culprit.
A sudden death in the morning and a burglary at midnight in a bookstore. Is one of the books holding a secret? While the lady owner seems to have a secret that she cannot tell.
Two members of a secret organisation have died consecutively. Their deaths are linked together by a mysterious chemistry formula. While the cause of their deaths is discovered, the source of the deadly substance remains unknown.
A theatre manager complains to Su Wenli about a ghost in the theatre but Su Wenli dismisses it. Until strange things happen one after another and she is nearly killed by a falling object.
The murderer turns out to be a person pretending to be a ghost. Later, Su Wenli finds out that the case is mysteriously linked to an actress's suicide twenty years ago.
A painting of Su Wenli from years ago leads to murder. Not long after the famous painter's widow visits Su Wenli, someone breaks into her house to steal the painting.
The victim turns out to be a witness to the painter's murder seven years ago. The witness's description may point Su Wenli's former flame and this stirs up Su Wenli's emotions.
The mean and nasty editorial assistant of Linglong Magazine is found dead in the office before getting off work. The murderer is among the six of them: the chief editor and employees. Who did she offend?
Another female editor dies after being pushed off a building and an important piece of evidence goes missing. Everyone is being interrogated and a love affair in the publishing house comes to light.
A cotton mill technician dies in a weaving machine. Su Wenli suspects the mill owner but when the owner dies after falling off a building, Doctor Liu Ruqing becomes the prime suspect.
The owner's sister takes over the mill while Taozi is instructed to work undercover and investigate. But she finds herself in grave danger when she discovers the identity of the murderer.
Su Wenli brings Taozi to a high-end boutique but a murder takes place in the changing room. The boutique is owned by two hostile sisters. Did one of them kill the wealthy customer?
A tailor is murdered when Su Wenli sneaks into the boutique at night. The murderer makes a clever escape. Danger lurks in the seemingly stylish and glamorous boutique.
A young beauty pageant contestant is found dead in Suzhou River. Questions arise on the girl's intention of appearing at the river during midnight. Is it a malicious temptation or a dark secret?
Luo Qiuheng finds the young girl's lover, a university student from a wealthy family. On the night of the incident, the girl asked him to meet up at Suzhou River but the boy claims that he didn't turn up.
A radio station employee dies mysteriously after work, her body is only found the next morning. Su Wenli and Luo Qiuheng decide to infiltrate the radio station which is already short of staff.
While Luo Qiuheng and Su Wenli infiltrate the radio station at night, someone attempts to set it on fire. Su Wenli finally uncovers the murderer's secret in the broadcast studio but is held at gunpoint.
The police commissioner is arrested for allegedly murdering a nightclub dancer who was found dead in his house. Su Wenli realises he is the father of Inspector Luo's ex-girlfriend, which makes things awkward for Inspector Luo.
Investigation in the nightclub leads Su Wenli to discover the dancer had stolen an important item from the nightclub lady owner. She is killed after trading it with a mysterious person.
A female circus performer is murdered and nailed on a wooden cabinet used in the dagger-throwing performance, with a snake wrapped around her neck. Prior to the investigation, a person owns up to the crime.
Su Wenli secretly searches the circus owner's safe and finds clues. Meanwhile, two prisoners die in a fight. Su Wenli deduces that it is related to the murder in the circus.
Su Wenli's aunt is busy preparing a birthday dinner until a female servant is found dead. Luo Qiuheng prepares to start questioning, but the butler's wife goes missing.
Though the missing butler's wife sheds lights on a scandal in the family, the dinner continues. Unexpectedly, Su Wenli's adopted daughter is almost kidnapped.
Numerous people who seem to be unrelated have died in the same brutal way and the person behind it might be Ding Rushan. Luo Qiuheng decides to reopen the case of Su Wenli's missing younger sister.
Ding Rushan who kidnapped Wenli's younger sister escapes from prison and plans to lure Wenli out. Wenli sets out to rescue Inspector Liu from danger and finds out the truth about her sister's fate.
