Upon hearing of his brother's death, Shannon returns to his old stomping grounds to find the men responsible and take justice into his own hands....

　　盗贼麦尔斯（马丁·劳伦斯 Martin Lawrence 饰）与三名同伙合作盗窃钻石，岂料其中一人德克背叛了他们，警方被惊动，麦尔斯走投无路，只得逃跑中将钻石藏在一栋未完工的大楼通风管道里，之后束手就擒。两年后，麦尔斯刑满释放，但外面的一切似乎都已改变，女友不再需要他，而当年他藏钻石的那栋楼居然变成了——警察局！为了取回钻石，麦尔斯偷到ID卡，又凭借伪造的档案乔装成警察混入警局，由于警方缺人手...