While PING ON and TIN MAN shop in a department store, they meet the robbery. The robber is caught by PING ON and TIN MAN. The robber threatens that he put a bomb in the department store. Unless he is released, he will not tell the place. TAI YAN arrives he shows nervous. PING ON uses his talent and finds out the bomb. He is appreciated by people. TAI YAN feels unhappy. PING ON is a smart policeman. His wicked wife, YUK HING uses to urge him for early retirement. Under his wife's pressure, he decides to retire. He sets up a detecting house. He continues his aspiration to arrest and clear up criminal cases. PING ON gets minor cases, such as romantic affairs, adultery cases or find the kitten and dog. He feels useless as he cannot display his ability. One day, a lawyer who represents a wealthy man, KIM CHEONG SHAN visits PING ON. He appoints PING ON to investigate a poison case.… ...

PING ON and TIN MAN try to make friend with KWOK YEE. However, she appears to be cool and taciturn, they are unable to keep close to her. In fact, after her husband's decease, KWOK YEE returns home. She takes over the job as housekeeper. The other family members look down on her. She maintains good relationship with WING SHUN and LAI WAH. CHUNG and WAH have the night snack in the kitchen. CHEONG SHAN sees and scolds them being too waste. SHAN puts all the blame on WAH. PING ON follows KWOK YEE, he finds she buy s some rat vermicide. He suspects KWOK YEE but he has no evidence. He asks SHAN to be carefully. KWOK SUNG fonds of LIN SUM's pretty. He uses to molest her.TIN MAN sees and he helps her. KWOK SUNG leaves with anger. TIN MAN has a deep impression on LIN SUM. WING SHUN thinks her sister's death has been caused indirect by CHEONG SHAN. She is over stimulated and has psychosis symptom.… ...

TIN MAN misunderstands LIN SUM hates CHEONG SHAN so she has the intention to kill him. He confronts her. LIN SUM denies and leaves with anger. Actually, LIN SUM is deeply moved by TIN MAN. Due to her revenge has not reached, she feels not suitable to think the love affair. TIN MAN shows difficult to suppress his feeling by rational. He is contradicted. KWOK YEE and LAI WAH go to play bowling. They have conflict with FEI CHEUNG. They all go to police station. CHEONG SHAN feels losing face and scolds them strongly. In fact, LAI WAH married KWOK CHUNG because of her pregnancy. She has been suffered the abortion after her marriage. CHEONG SHAN regards her as a thorn in the flesh. He persuades KWOK CHUNG to make a divorce with LAI WAH and remarry. LAI WAH endures. PING ON investigates step by step. He discloses the family members' complicated relationship. He finds out the clues to clear up the case.… ...

After WING SHUN has been discovered as the murderer, she frankly admits. She has seen her sister's will few years ago that her sister died because she cannot endure CHEONG SHAN's abuse. She hates CHEONG SHAN and waits for the chance to take revenge. WING SHUN becomes crazy and she wants to die together with CHEONG SHAN. Fortunately, PING ON duly stops her. CHEONG SHAN sends WING SHUN to the sanatorium and he never allows her to step in the family. PING ON finds that KWOK YEE also helps WING SHUN in the poison case. As to avoid further family struggle, he hides the truth. He only gives warning to KWOK YEE. KWOK SUNG owes a large amount of debt. He seeks help from KWOK PING. The couple cannot help him. They want to cooperate with KWOK SUNG in collusion. KWOK SUNG pretends to be kidnapped and asks CHEONG SHAN a large amount of ransom. PING ON wants to withdraw but CHEONG SHAN asks him to settle KWOK SUNG's kidnapped case.… ...

CHEONG SHAN scolds KWOK PING and his wife for their disobedience. KWOK PING blames CHEONG SHAN who controls his development outside. He has financial difficulty. He has no other method so he does this. After this issue, the couple is intimidated by CHEONG SHAN and they cannot raise their head. KWOK PING finds he has no position in KIM's family. He wants to get back the ransom for other development. But KWOK SUNG gets the ransom. KWOK PING's hope is gone. KWOK CHUNG knows the past relationship of WAH and ON. He suspects they will become lovers again. His attitude towards WAH turns cool. This makes WAH feel she does not like to stay in KIM's family.