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.