交换的一天

　　30年代的香港，社局动荡，黑帮林立。香港大亨胡老头这日找到私家侦探哎吆（林子祥 饰），要求其调查胡太太，因为他觉得胡太太这些天表现奇怪。哎吆调查后发现，原来是坏蛋神父卡邦派（麦嘉 饰）人勾搭上了胡太，意欲偷取胡老头价值连城的股票。他们这一计划遭哎吆撞破后，四处追杀哎吆。　　哎吆亡命之际，又发现了胡老头其实并非什么香港大亨，只是一名老千，他来香港的目的就是要骗卡邦等流氓的钱。胡老头邀请哎吆入伙，一起设局骗卡邦。和好友探长罗宾（泰迪•罗宾 饰）商量后，哎吆决定来个将计就计。

Raka, a court security officer, and his pregnant wife, Nina, celebrate her success in passing the bar exam. While they have a rare evening of fine dining to savor the moment, their joyous celebration is shattered when Nina is found brutally murdered. The investigation quickly identifies Dika as the prime suspect, leading to his swift arrest. However, with the support of a shrewd and manipulative lawyer, Timo, the trial takes an unexpected turn that Raka could never have anticipated. As the trial spirals towards an unjust outcome, Raka resolves to overturn the corrupt verdict and seek justice for his late wife.

　　1993 年，发生了可怕的事件：一个神秘的儿童节目主持人克罗克特先生神奇地从电视机中出现，绑架了年幼的孩子杀害了其父母。而在克罗克特先生绑架了女主的儿子之后，女主开始了危险的追寻之旅，她要找到这个恶魔，救出她的儿子。

　　民国年间，上海滩闸北区保德路发生一桩命案，死者后来经过确认，竟然是马源商会老板马广则。　　多年来，马源商会在闸北一直都颇具影响力，马广则更是最被看好的商界风云人物，他的死打破了闸北区原本的宁静。