Three cases of rape-and-murder have occurred recently. The three victim were strangled to death by the killer and neither finger- prints nor sperms can be found. The police force set up a special team to handle the case. MAN is transferred to YUNG's team to give him a helping hand. YI also returns after his vacation. YUNG finds that the three victims uses the perfume “Envy”. It has special scent and is not popular. Few customers use it. Incidentally YUNG discovers that CHIT's uncle WAI had taken photographs of the three victims in his studio before the tragedies occurred. WAI is suspected. They keep an eye on WAI and finds that he courts DAISY. They go to a hotel and after thirty minutes. the girl screams for help.

It is find that WAI and DAISY quarrel as they cannot compromise with the price involved in the filthy transaction. YUNG also finds that WAI's behavior is different from that of the murderer. However a witness recognizes that WAI was with the third victim before being killed. WAI admits that that night he escorted her home but after that he returned to his studio. As there is no one proving' WAI's statement, he cannot prove that he is innocent. WAI’s counsel KIT and four waiters claim that WEI was in the coffee shop of a hotel and he wore an orange jacket. As the jacket has been sent to a laundry, KIT's statement is not accepted. In fact WRI tries to hide the truth as his filthy relationship with the owner of the hotel may be disclosed. The fourth case occurs and ADA is the victim. Luckily ADA regains her consciousness.

ADA reports that she was attacked by the sex maniac from behind and she fainted. YUNG gets an idea and they narrow down their scope of investigation to doctors and YUNG- finds that doctors have more chances to be close to their patients. After checking it is discovered that all the four victims were clients of St. Peter's Clinic. SUT, MING and CHAI are suspected as they' are doctors there. MAN is instructed to go to the clinic to bait the real murderer with “Envy”. She takes refuge in a unit being protected by the police. The killer arrives but is frightened by the alarm of the life which is out of order. YUNG sees the car of the villain and they focus on SUT and CHAI as they have the car of the similar style. It is found that SUT had bought a bottle of “Envy” near MAN’s unit and then he disappeared. It is rather certain that SUT is the sex maniac as the four victims’ records are found in his house.… ...

However medical checking shows that SUT had been poisoned to a comatose state before being killed in the traffic accident. Moreover there is no finger-print on the steering wheel. It is certain that it is a set up murder. YUNG and YI rush to save MAN but it is too late. MAN has been kidnapped by CHAI. Seeing that he has been surrounded, CHAI releases MAN and goes to the roof, trying to kill himself. CHAI committed the cases as he was shocked by his wife who had betrayed him. The situation worsened as he found that his son was not his flesh and blood. His anger explodes when he met the victims with “Envy”. His wife had a gift of “Envy” from her secret lover. He went insane and calmed himself by killing the victims. When he knew that he was suspected, he used tricks to frame SUT but in vain. He has to face trial by the law.

In a used car lot, a corpse is found. It has been burnt seriously. The only hints about the identity are the feminine gender and the letters “TL” on her necklace. FUNG asks the public to supply useful information through the mass media. The next morning a teacher working in an evening institute. The identity of the corpse is clarified. She is LAI and has disappeared for three days. On the other hand, the press receives information from CHING who tells the press that LAI killed her daughter in a traffic accident one year ago. YUNG goes to ask CHING but cannot find her. He suspects that LAI was killed by CHING who wanted to avenge her daughter's death. More background of LAI is disclosed. Before working as a teacher in the evening institute, LAI worked as CHEUNG's secretary. She was dismissed by CHEUNG's wife who was discontented with the intimate relationship between CHEUNG and LAI.… ...

FUNG does not agree with YUNG. She refuses to continue the investigation as it is a waste of time and resources of the police. CHIT uses YUNG's idea as the main theme of her novel. She realizes that if YUNG is correct, LAI's situation is dangerous as she may be killed by CHEUNG who wants to keep his secret. Meanwhile the police find LAI and CHEUNG in a flat. CHEUNG is dead. LAI is sent to the hospital. When she regains her consciousness, she reports that CHEUNG attacked her so as to keep his secret. It happened as YUNG suggested. However it is found that CHEUNG was not killed by a knife. Instead he was poisoned. CHEUNG's wife declares that she killed CHEUNG with pesticide as she knew that CHEUNG was not loyal to her. The case is solved.

YI and CHI go to Japan to enjoy their holiday. Before getting abroad, YI meets HO whom is believed to have died for five years. YI delays his trip to find what has happened. YI and HO lived in the same walled village. HO left her home as she was forced to marry a man that she did not love. She went overseas to study design. SAN was HO's boyfriend. The police questioned him and suspected that HO had been killed by SAN as some blood stints were found on his jacket. SAN admitted that he had been in HO's house. Though he was suspected, the police did not have strong evident to prove him guilty. SAN was set free. Later SAN killed himself and left a letter stating that he felt guilty. YI checks the file of HO's case. He is shocked to see that SAN cannot kill himself with the rope as he used his left him. YI suspects that it is a homicide.

YI visits FUK, who is SAN's father. It is too late as he has died for two days. The way of handling the rope is the same as SAN’s. FUK has no reason to kill himself. There are a Double-T ticket and a map in his pocket. With the help of the map, the police find BILL's corpse. BILL is a wanted criminal who committed a bank robbery five years ago. He was killed but the money is not with him. As BILL and HO have the same blood type, thus five years ago, BILL was killed instead of HO. It is clear that the one who has taken the money is the killer. SAI, CHOI and KEUNG are suspected as they became rich in the past five years. MAN returns to FUK's house and a needle is found. She realizes that FUK was paralyzed and became unconscious before being killed. They check FUK corpse and MAN's idea is proven.

KEUNG is the only one who knows Chinese medicine and the use of needles. YI is aware of the unnatural response of KEUNG's wife PING. He follows her and finds HO being locked up in a deserted warehouse. PING is going to deliver a baby. YUNG sends her to hospital and tries to contact KEUNG. He cannot find KEUNG as KEUNG has gone to Devil Hill with YI. YI and KEUNG are good brothers. YI tries to convince KEUNG to surrender himself to the police. He does not know that his life is endangered. SAI, CHOI and TSUI are KEUNG's colleagues. They try to kill YI. YUNG comes and fires his gun. TSUI is so afraid that her gun hurts SAI. She and KEUNG run away. KEUNG is arrested. He goes to the hospital and he finds that his wife is safe. He tells the police everything about the case. SAI dies as he has been injured seriously. TSUI kills herself as she feels guilty. CHOI is arrested.

YUNG meets his former supervisor KAN. Now they are of the same rank. CHUN, who is the grandson of the King of Jewelry, is kidnapped. KAN is sent to YUNG's district to investigate the case. YI checks the CHIUs. The eldest son of the family has died and his wife controls the fortune of the family. The second son is discontented with his sister-in-law. However he is not a talented man. He only enjoys his life. As the second son is in financial difficulties as he indulges in gambling. The second son is suspected. The criminal calls the second son and asks him to tell the others the arrangement of giving money. The police suspect the second son. However the criminal does not come as stated. The criminal calls again and the phone is received by the branch manager. The second son may not be the criminal. Suddenly the criminal arrives in a car at high speed. He takes the money away. The police follows him.

KAN's prediction is wrong and thus the criminal manages to escape. Luckily CHUN is saved. The police view the video tape over and over again and at last it is recognized that the criminal is TUNG who was a policeman. He was arrested by KAN and was dismissed as he had stolen the money robbed from a bank. YUNG follows TUNG's elder sister to the flat where TUNG stays. However he has left. TUNG's sister tells YUNG that she was given two hundred thousand dollars by TUNG. TUNG told her that he had won Mark Six. After checking it is proven that the money belongs to the CHIUs. YUNG and KAN want to arrest TUNG. KAN is so quick-tempered that he guns down TUNG.

Incidentally YUNG finds a boy's shoe in KAN's house and it is of the same pair of another one being found in TUNG's house. KAN knows that his secret is discovered and admits that he is involved in the case. TUNG kidnapped KAN's son to take vengeance on KAN. KAN kidnapped CHUN so as to get the money to save his son. A corpse is found in a construction site. WING checks it and finds that the man died six or seven years ago. He has six fingers and wounds are found on his bones. YUNG seeks help from HIN. With computer technology, HIN rebuilds the dead man's appearance so as to identify him.

However HIN’s method cannot be employed as a piece of acceptable evident in the court. The model is lost on its way back to Hong Kong from the United Kingdom. YUNG takes the draft and asks the people living near the construction site. At last it is recognized by BING who owns a store. She recognizes him as LEUNG and he was LAN's boyfriend. It was said that he had gone to Singapore. KUEN is LAN's friend. LAN has a son and a daughter. LAN always quarrel with WING. She asks KUEN to keep an iron box for her as she is afraid that WING may dispose of it. The police visit LAN. LAN is shocked to learn that LEUNG is dead. WING is also shocked and he asks the police to leave.

LAN uses town gas to kill herself. Though she is saved, she is in a deep comatose and has little chance to wake up. As LAN’s keys are lost, YUNG suspects that LAN was murdered instead of committing suicide. He also finds that WING tries to find something in LAN's house. KUEN gives the ox to the police. It contains a letter and a photograph stating that WING was all right in Singapore. However it is found that the letter was written by WING. The lost model is found in WING's house. The police also discover that WING makes frequent donations to St. Maria's Church. WING is questioned but no further information can be obtained. He is set free. The police keep an eye on WING and find that WING asks his girlfriend YAN to take money and flowers to the church. Suddenly WING reports to the police that he was the killer of LEUNG and LAN. He did so as he hated LEUNG who wanted-to take the role of his father.… ...

LAN regains her consciousness. She tells YUNG that WING did not hurt her. That day BING visited her and questioned her. BING was LEUNG's intimate girlfriend and she was angry as LAN had killed LEUNG. In chaos BING pushed LAN to the floor and LAN fainted. BING is questioned but she refuses to admit. At last WING claims that he is the witness and BING admits that she hurt LAN. However WING is still accused of having killed LEUNG. MAN finds that WING's sister WAI lives in the church. WAI became crazy after being raped by LEUNG. Her condition has improved and she admits that she killed LEUNG. Now she realizes that if she want to forget the unpleasant experience, she must confront the reality before the God. WAI is not accused with YUNG's assistance. WING is happy to see this arrangement and he marries YAN. He and his family turns a new page of life.

WA is a magazine journalist. His corpse is found in the woodland near Butterfly Stream. He was hit with hard objects and died for losing too much blood. There are many mysterious points about his death. His house had been searched by unknown persons after his death but his money was not taken away. Moreover it is found that over one million dollars has been deposited in his account. The police suspects that WA was killed as he wanted to disclose some scandals. As WA was dealing with LING, who is a singer, LI, FUNG and MIN, who are actresses, they become the targets of investigation. FUNG invites MIN and LI to act in a film invested by her. FUNG and MIN have announced their engagement. LI falls down from a ladder in the studio and dies.

It is realized that LI is not involved in WA's case. She needed money not because of being threatened by WA, instead she used the money to help her brother. As the screws had been loosened before she fell from the ladder, it is clear that she was murdered. YI thinks that it is only a joke instead of manipulated homicide. FUNG and. MIN have announced their engagement and the ceremony takes place in FUNG's house. However FUNG announces it is only a gag. He will not marry MIN. MIN feels being fooled. She is discontented as FUNG has another lover. She is on the brink of collapse but she still promises to act in the film. She tells the journalist that she wants to avenge her being humiliated. When they are acting, MIN shots FUNG with a real gun. FUNG dies and the others are shocked.

MIN is arrested. In MIN's car, YUNG finds the forgery gun. Most likely she has left it in her car and she wants to destroy it. At the same time, an informant reports that the gun was sold by a drugs smuggler to a girl looking like MIN. MIN is accused of committing homicide. The police starts questioning FUNG's previous lovers. They are surprised to know that all the “lovers” are gags of the film making company. All the “lovers” state that FUNG is a good man.

The case becomes more complex as the solicitor announces that FUNG wants to give one-sixth of his fortune to his manager SAU and one-half to his lover MIN. After consideration, the police figure out that LI died for MIN as MAN should be the one on the ladder. Thus the one being threatened may be FUNG. A camera is found in FUNG's house. The film is finished and the photographs are shocking. MIN goes to FUNG’s house where she sees SAU putting on dresses. In fact FUNG and SAU are lovers. Their abnormal love was found by WA who blackmailed them. SAU killed WA to keep the secret. Later FUNG fell in love with MIN. FUNG changed his mind where he knew that SAU had killed WA for him. However he did not want to continue the love. SAU hated MIN and wanted to set up a trap to frame MIN having killed FUNG. His plan was spoiled by the video tapes.

When SAU is going to kill MIN, the police arrive. There is a gun fight. MAN protects YUNG with her body. SAU is killed. MAN is hurt seriously. Fortunately she recovers. However her legs are paralyzed. There is only fifty percent of recovery. YUNG looks after her as his life was saved by her. However CHIT is jealous. LUN's corpse is found on the stony beach of Tai Mong Tsai. For checking it is found that LUNG had taken sleeping pills before being killed by carbon monoxide. LUN is a keen gambler and this hobby always put him in financial difficulties. His wife is PO and KWAN is his secret lover. They have witness to prove that they were not with LUN when he was killed. LUN owns a saloon. PO works in a flower shop and KWAN is a taxi dancer. Before LUN was killed, the guard of the building saw a girl in red clothes came to drive LUN away. However he could not see the girl.

LIK, who is the partner of LUN, is suspected as the killer for three reasons. Firstly, his father runs a garage and thus LIK is good at car mechanics. Secondly LIK and LUN had quarrels over financial matters. Thirdly LIK and KWAN has filthy relationship behind LUN. However LIK has witness to prove that he was not with LUN when LUN was killed. The police go to question PO's family but no useful information is found. When they are on the way back to the headquarters, they meet a truck driver. His truck's tires went flat at Sap Shi Heung when LUN was killed. He saw a girl in red clothes driving a white car and leaving in a hurry. Thus they return to the scene where they find a burnt cigarette with lip prints on it.

However the case has not been solved. LUN was taken away by the girl in red at 8:00 p.m. and she was seen at Sap Shi Heung at 9:00 p.m. At 10:15 p.m. LIN was killed at Tai Mong Tsai. YI accompanies PO and her grandmother to home from hospital. YI finds an old photograph taken when PO was a student. YI suspects PO's classmates and thus he takes the photograph away. As the school has been pulled down, YI seeks help from computer experts. From the photographs, the recent appearance of the three students are projected. One of them is KWAN. As PO and KWEN were classmates, YI finds that KWAN's cigarette is the same as the one left at Sap Shi Heung. He also discovers that KWAN had stolen her neighbour's car which is white in color when LUN was killed. At last the police conclude that LUN was killed by KWAN and PO. KWAN and PO killed LUN as both were sent to hospital. When they met, they realized that both of them had been deceived by LUN.… ...

CHUNG, who is a merchant, is found killed in the suite of a hotel. He was strangled to death when he was in a comatose after being hit. He money has been taken away. CHUNG and his cousin LAM won six hundred thousand dollars from the horse race. He took the money to a ballroom alone as LAM had to go home for private business. There CHUNG wanted to hire JUDY to play SM with him but he was refused. BETTY states that JUDY did not go with CHUN. BETTY’s statement is further supported by her customer FAY. Thus JUDY is not regarded as the suspect of the case. CHIT visits a doctor from whom she learns a case of a poor baby girl. The baby girl is waiting for financial support to go overseas to receive proper treatment. CHIT reports her case and it draws public attention. An anonymous old man donates six hundred thousand dollars to support the baby girl.

The surgery is successful and the baby girl regains her healthy. CHIT has done much for her. CHIT is surprised to find that the baby girl's mother TUNG TUNG is BETTY. BETTY pays little attention to her baby. CHIT is discontented and always looks after the baby for BETTY. LIN is the owner of the hotel where CHUNG was killed. He is found dead in his house in Sheraton. He died after drinking poisonous milk. He has a complex family. CHU is the daughter given birth by his ex-wife. KWONG is his son-in-law and his nephew KAI is his wife WA's good friend. WA is much younger than LIN. CHU, KWONG, KAI and WA have different people to prove that they were not in the house when LIN was killed. The newspaper hawker reported that there was a mysterious lady wandering outside the house when LIN was killed. When the murder was committed, the rear door had not been locked. Every day SHEUNG takes the milk there.

Another witness tells the police that CHU's car was outside the house when LIN was killed. CHU changes her statement. She claims that. before going to the airport with KWONG, she visited her father and seek financial support from him for her husband. However the time she left was close to the time of LIN's death. CHU accuses WA and KAI as the killers as there is filthy relationship between them. WA accuses CHU as CHU is unable to pay her debts. FAY is also suspected as they had quarrels. FAY works as a cook in LIN's hotel. He was introduced to the job by KAI. FAY's working attitude is poor. KAI and RAY have long not met each other. On the day when landslide affected Tuen Mun, they came across each other in a restaurant in Yuen Long, they did not greet each other. As the landslide and the murder occurred on the same day, the police find that FAY's statement supporting BETTY becomes invalid.… ...