Fan (Bobby Au Yeung) heads a team of detectives in the “Special Duty Squad” responsible for investigating various prostitution practices. Fan and his subordinate Sergeant Tit (Wan Yeung Ming) have solved many cases and are well-experienced, they have dealt with cases under cover of an exclusive association; model agencies seducing innocent girls to work as prostitutes; loan sharks forcing women to pay debts by working as prostitutes. Although Fan has excellent performance at work, his family life is not happy. His wife May divorces him. He is then accused of rape by a prostitute. Detective Fung (Kennix Kwok), who is in charge of the investigation, is discontented with his behavior. When she realizes that she has misunderstood him, she gradually falls in love with him! Then, Fan and his colleagues are assigned to smash the gang led by Lung (Ngai Chun Kit). When Tit discovers that Lung is competing with him for her girlfriend Kwan (Jan Lau), she swears to put Lung behind bars.