The king pin of the Manix Private Detective, Joseph Wong(Michael Hui), together with operative Lee Kwok Kit(Sam Hui) and Pighead(Ricky Hui), are going to solve several cases for the clients.

• 万能私家侦探社社长黄若思(许冠文饰)连同职员李国杰(许冠杰饰)及鸡泡(许冠英饰)成工为多位客人侦破案件，屡建奇工，期间当然搅笑连场。