WESLEY opens a private investigation company with his friend KWOK TSAK CHING in Shanghai. One day, YUE TING MAN, the treasurer of the Green Gang, comes and asks WESLEY to help hunt for treasure. But WESLEY, who is only interested in strange things, turns him down. KWOK begins to grow suspicious of MAN and decides to follow him. While KEI WAI, son of the chief of the Green Gang PAK, is questioning MAN about the treasure, KWOK is caught and innocently gets involved in the matter. KWOK is brutally beaten to unconsciousness, and MAN is taken away by WAI. Police officer TIT TAN has found a paper monkey from KWOK, which is actually the clue MAN leaves for KWOK. WESLEY’s cousin WONG HUNG HUNG sees the logo of a nightclub on the paper monkey. WESLEY thus heads for that nightclub to look for more clues. MAN dies while being questioned. WESLEY starts an investigation around the place where MAN died. There he meets WAI’s sister PAK SO……

SO is going to kill WESLEY but for a split second, she decides to let him go simply because she has a crush on him. SO works in a hospital as a doctor. WESLEY goes to pay her a visit and there he meets KWOK, who has just woken up from coma. KWOK tells him what has happened and WESLEY suspects that WAI has something to do with MAN’s death. Leader of the Yellow Dragon Gang TSUN CHING HEI is on his way to a secret meeting with the mobsters. He is mistaken for a thief and is arrested by a police officer. Luckily he meets the supervisor of a pawnshop CHAN CHEUNG CHING, who comes to his rescue. WAI discovers that WESLEY has been following him around. The two of them soon get into a terrible fight. WESLEY has made a pendant necklace with SO’s bullet that almost took his life. He gives that necklace to SO on their first date. SO questions WAI about the death of MAN and WAI admits that he is involved in the plot……

During the meeting, every member of the gang takes out an iron plate on which part of the treasure map is carved. WESLEY’s true identity has been discovered. PAK and other mobsters go to capture WESLEY but SO turns up suddenly to rescue him. WESLEY is safe but SO gets seriously injured. Meanwhile, WAI has successfully stolen all the iron plates. WESLEY comes back to see SO, and explains to PAK what has happened. PAK is so shocked when he gets aware of WAI’s plot. He has great feelings of guilt towards other members. WESLEY asks inventors GOBI and DESERT to help HEI draw the treasure map depending on his memory. However, they do not succeed. HUNG has a very good memory. She has had a glimpse of the iron plates and is able to draw a complete treasure map. SO gets aware that the treasure is hidden somewhere in the province of Guangxi……

In Guangxi, WAI finds the mill at where the iron plates were cast. With the help of KAR LO YEE, leader of the Tiger Gang, WAI discovers that the treasure has been hidden in the mountain. SO and WESLEY are attacked by WAI’s assistants as soon as they arrive at Guangxi. HUNG, who is also interested in the treasure, is heading for Guangxi. But shortly after her arrival, HUNG is held hostage by WAI. WAI and KAR go uphill to look for the treasure. KAR wants to keep all the treasure and means to harm WAI. WAI almost falls off the cliff. Luckily WESLEY is around and he pulls WAI back just in time. To ensure his plan goes well, WAI needs to remove anyone who may cause trouble. For this reason, he even seeks to assault WESLEY. PAK, who has gone to Guangxi, persuades WAI to give up the treasure. WAI, however, challenges WESLEY to a contest to see who will find the treasure first. WESLEY accepts his challenge……

Before she leaves, SO takes out the bullet necklace and asks CHAN to return it to WESLEY. One day, MRS. CHENG, widow of the late tycoon CHENG TIN LUK, comes to see WESLEY. She asks WESLEY to assist her in finding out if LUK is still alive, as there is a rumor that LUK is being locked up in the secret chamber. The story has also been covered in local papers, which makes CHENG believe that LUK is still alive. WESLEY promises to help CHENG find out the truth, even though he is not much interested in the case. KWOK goes to the newspaper office to meet WAN PO YUE, the reporter who wrote the story of LUK. But KWOK is told that YUE has already been dismissed. KWOK discovers that LUK’s son CHENG PO WAN is deeply in debt and that he could inherit his father’s property right after LUK’s death. It means WAN can pay off the debt once he has got the money from his father. This makes WESLEY suspect that WAN may have something to do with LUK’s death……