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.… ...