Various distinguished members of Hong Kong high society were being blackmailed by mysterious and attractive lady Chang Siu Juen, who seems to know the secrets of their past and present illegal activities. Millionaire Cheng Yung Seng knew that it would be his turn next. He thus planned to eliminate Chang first but the plan did not work out and Chang was saved by private detective Fang Dai Kuen...
鄧光榮
as Fang Dai-Kuen
Tang Ching
as Cheng Yung-Seng
班潤生
as Cheng's thug
Sombat Metanee
as Insp. Lo
林建明
as Chang Siu-Juan / Chen Wan-Lan
林偉棋
as Private eye Huang Sin Wei
錢月笙
as Cheng's thug
Che Dei
as Huang's employee
陳龍
as Cheng's thug
陳會毅
as Cheng's thug
Gam Tin-Chue
as Extortion victim
Aranya Namwong
as Tin Hsiang
