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Magnum Private Detective Agency is a small detective agency with only three staff members including the president Huang Ruosi (Hui Guanwen). Due to the tepid business and Huang Ruosi's stingy and mean person / employees Fugu (Hui Guanying) and Jiqi (Zhao Yazhi) / especially the former / suffered a lot. Li Guojie (Hui Guanjie) / who used to work in a soda fountain factory / was fired by his boss for slacking off at work. He came to Wanmian to apply for a job because of his good skills. Huang Ruosi refused to hire him at first / but then saw that he did have two skills and accepted the job. The salary was naturally harsh. Before Li Guojie came / Huang Ruosi and Fugu partnered up to investigate some affairs / theft / and fraud. Not every case of these cases could be solved / and the detection process was often full of embarrassment and was far from perfect. However / the various aspects of Hong Kong society at that time were clearly visible. After he came / the cooperation between the three of them was the same. What's even worse is that they are often mistaken for criminals by the police detective (played by Wu Yaohan). Several cases / both large and small / were handled / especially the case of an eighty-year-old man's beloved wife (Lu Huizhi) having an affair with someone else (Ng Yao-han). Li Guojie showed that he had a stronger working ability than Huang Ruosi / and was more favored by clients. One day / Huang Ruosi and Li Guojie were entrusted to go to a theater that had been threatened by robbers and was now in and out of robbers. In the process of capturing the robbers / Huang Ruosi
万能私家侦探社是一家连同社长黄若思（许冠文）在内只有三名工作人员的小侦探社，由于生意不咸不淡，加上黄若思为人小气刻薄，员工河豚（许冠英）和积琪（赵雅芝），尤其前者没少遭罪。原在汽水厂上班的李国杰（许冠杰）因工作偷懒被老板解雇，一身好功夫的他来到万能求职，黄若思起初不肯雇用，随后见他的确有两把刷子，应了下来，薪水自然苛刻。 李国杰没来之前，黄若思与河豚搭档侦探的，无非一些风流、偷窃、欺诈事务，这些案