警探李SIR即(jí )将退休，却遇上内(nèi )地悍(🔼)匪来港械劫珠(🕸)宝，女匪(fěi )徒宋玲将珠宝(🎹)藏(🆖)于电梯内，玲(🔬)之(zhī )男友阿伟把(😧)李(lǐ )SIR的佩枪夺去。警方增(zēng )援赶到，宋玲被捕，伟(wěi )被(🛍)迫逃走(zǒu )，藏身于(yú )出租车司机大(dà )(🚥)麻(🐖)成家，大麻成欠下高(🍮)利贷，儿子(zǐ )阿(ā )磊(🐶)患有自闭(😱)症，女儿(💞)阿蓉乱搞(📎)男(🧚)女关(🔩)系，伟为免节外生(shēng )枝，期间把上门讨(tǎo )债者和要求与蓉(róng )分(fèn )手的(de )男友(yǒu )一一(🌞)打(dǎ )发走，令(🙉)大(💪)麻成一(yī )家对伟产(🥫)生好(hǎo )感(gǎn )。李SIR不想(💠)临近退(tuì )休(🤳)因为失枪而受影响，希(xī )望靠自(🗳)己(jǐ )夺(🈁)回失枪。李SIR押解宋玲，伟(wěi )计划营救，岂料悍匪头目阿光与同党(💹)半(bàn )途劫(💯)走宋玲和李SIR逼玲说(🔍)出(😙)珠宝下(xià )落(🔤)。光(guāng )生性凶残，要将(jiāng )李和玲灭(🔞)口(🏴)以独吞(🔎)珠宝。伟(👄)只有(yǒu )一把从(cóng )里SIR手(shǒu )上夺得(dé )的警(🔲)枪，却(😳)要挑战阿光(🍺)及(jí )其(🐂)同(tóng )党(🛃)强大的火力。