Content:
Pak Kam-long and Hak Nam-ma are private detective. They are also born enemies. A valuable Night Gem is stolen from Yim Sai Chung's home. They thief claims to be Tsang Cho-choi, but nobody knows who he is. This Tsang is in fact a very good friend of Yim's who is also a wealthy man with the name of Wong Yat Cheung. The police advises Yim to hold a cocktail party and all his friends are invited including Pak and Hak. In the party, again, some lady's pin is stolen and is found stuck to Haks jacekt...