The film revolves around the exploits of an investigative company in Hong Kong called Mannix Private Detective Agency. It is headed by private investigator Wong Yeuk Sze (Michael Hui) with his psychologically drained pipes aide Puffy (Ricky Hui). On The Other Hand, Lee Kwok Kit (Samuel Hui), a martial art specialist, who operates at a Vitasoy plant factory and also invests a lot of the moment doing kung fu methods to excite a woman, eventually loses his task. Seeking to discover an additional type of work, Lee tries to signs up with Wong's detective agency. Regardless of Lee's perception with his kung fu talent which involves his seizing trick, Wong was not impressed. After that, as it appears that Lee would not obtain the task, Wong discovers that his purse was missing and also was presumed taken by one onlooker that encountered them. Lee intercepts him and recoups the budget, hence amazed Wong to hire him for the work.