In the prison, SHEK TUNG SING recalls his memory of getting commendation and preparing for promotion examination in the police force… Fifteen years ago, SING was dissatisfied that a rapist was acquitted on all charges with the help of his defense lawyer and the victim eventually committed suicide. The lawyer and his wife were being attacked at home. SING was there coincidentally and he fainted after a hit at the back. When SING woke up, he was shocked that both the lawyer and his wife were killed by his gun. The most critical witness of the case was SING’s best partner MAI ON DING. SING’s wife KAN CHUK KWAN was pregnant when he was sentenced to jail and they separated from each other for 15 years since then. Editor of Bao Magazine, HUI MAN HIM, makes the lawyer’s case a feature story and this helps to reverse the verdict of SING’s case unexpectedly……

SING goes to visit the dead lawyer’s secretary Ms AU and he discovers that some important information were not recorded in the case’s file… DING learns that CHONG SHUN has scolded SING and he consoles SING. However, SING didn’t reveal to DING that he has collected some new evidence. SHEK LONG dates her mother KWAN but KWAN finds JIT there with present and flowers… Somebody reports to the police that smelly water is coming down from the upper floor. SING arrives at the scene and he breaks into the suspicious flat. He discovers Uncle MAO sitting on the kitchen’s floor and a dead woman is found under the stove. The neighbours say that the dead woman WAI MEI came from mainland China and she married Uncle MAO for half year only. Later, Uncle MAO locks himself in the flat and commits suicide…

SING, DING and SZ carry out investigation in Uncle MAO’s home for they believe that Uncle MAO was killed by somebody… After discussion, they believe that MEI’s cousin is the key suspect and SING suggests luring him with MEI’s missing cat. MEI HA informs KWAN that KA CHAI is missing. KWAN is very nervous and she asks JIT to help finding him. SING returns home and he meets JIT… SHUN asks DING to clear the misunderstanding between him and the magazine editor. DING invites HIM for lunch but they start a quarrel again… SZ pretends to be the shopkeeper of a pet shop. HING FAI comes to adopt MEI’s cat and SZ talks with him. SING risks his life to capture FAI and DING rescues SING recklessly…

Uncle MAO’s case is resolved. SING brings all colleagues to JIT’s pub for celebration. SHUN introduces the retired superintendent KO LAP YAN’s son KO KEI YEUNG, probationary inspector, to everybody. He tells them that YEUNG will be working with them soon. Before the deadline, HIM is wondering if she should publish the headline story. While having late dinner with SZ, SIU KEI informs HIM that their boss Mrs BAO has decided to print HIM’s headline story without getting her consent… Some mysterious internal organs are found in the countryside and the police carry out investigation. DING seizes the chance to play tricks on YEUNG. They continue the investigation in nearby village and Village Head HO worries if the organs belong to his missing son… A blood-stained altar is found in the countryside… A child is missing and the police discover another blood-stained altar in the countryside…

The team learns that CHUNG, father of a missing child, has returned to Hong Kong so they visit him. Scavenger CHUNG reveals to DING that he was quarrelling with his wife TSZ KUEN since they were unable to pay their son’s school fees and his son was missing after that… HIM visits CHUNG with reporter TAI BUN. After sending CHUNG food and subsidies, HIM leaves CHUNG her name card and asks him to call her anytime. After some careful analysis, SING believes that CHUNG is a dangerous person but he doesn’t have enough evidence to search his place. SZ has an idea suddenly. HIM and TAI BUN visit CHUNG again to bring him an electric fan. While BUN is setting up the fan, HIM put a mini-camcorder at the window… SING tries to pick KWAN up at work but he discovers that JIT is trying to hold KWAN’s hand by force on the street…