Fa Kam (Mark CHENG) is one of the most respected elders of the gang. He has an impeccable eye for talent, especially in choosing his three underlings - Wah (Bosco WONG), Fei (Louis CHEUNG) and Kwok (Carlos CHAN). Fa Kam has been waiting to ascend to the gang's throne for years, but that plan comes under threat when a shipment of the gang's money is intercepted and stolen during transport. Caught between his gang and his two best friends, will things go Wah s way, or will he be relegated into a mere street rat?

《紮職3》是《紮職系列電影》的第三部電影，但《紮職3》是全新故事。社團首領花錦的手下阿華、阿飛和國仔，在一次替社團解款的行動中遭遇埋伏，導致巨款離奇失蹤。花錦的死對頭群哥藉此大做文章，興師問罪，意圖趁機奪取花錦即將獲得的龍頭寶座。權力鬥爭一觸即發，三兄弟也被捲入這場腥風血雨的鬥爭之中。在金錢與道義的抉擇面前，三兄弟將如何抉擇？