民国初年，赌坊蓬勃发展，被保安局视为洪水猛兽。保安队张队长假扮年前被杀的赌坊老板的儿子，往钱老板的赌坊要求赌命。因钱老板骗取朱老板的赌坊后，更杀人灭口。张队长赌赢了钱老板，钱不愿将赌坊拱手相让，更打算置他于死地。其后，钱表示愿意与张合作，给予他一半赌坊。但当钱以为张是朱老板的儿子，他决定不留活口。张被活捉，但逃脱了。原来张为负责扫荡赌坊而来，结果钱老板与他的伙计全被保安队带走。
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