一个老油条警探尼克麦克坎（伯特·雷诺兹饰）一直是单打独斗、雷厉风行。在一次办案中，不料一个八岁男孩狄凡巴特勒成为一件犯罪案件的唯一证人，而男孩向尼克提出要求，除非让他当一天警察，并提供徽章、手拷等全部警察配备，他才愿意出面指证，尼克不得已答应，结果狄凡当警察当出了瘾，发生连串惊奇冒险，尼克面对“小鬼警察”，头痛不已。...

...

Devon Butler is an eight-year old who dreams of being a cop. He watches police TV shows, knows police procedures, and plays cops and robbers with his friend Ray. One day, while snooping around in a wa...