(🕕)一(yī )(🍅)宗離(👷)奇(🔨)失蹤(zōng )案(àn )(✒)，讓(ràng )山(shān )(📼)叔(📒)（許(xǔ )紹雄飾(shì )(🌰)）(🃏)痛失(shī )(😘)了(le )愛妻(qī )山嫂(sǎo )(🕰)，也(yě )讓(ràng )張(zhāng )以靜(jìng )（(🎹)高(🆖)海寧飾(shì )(🛤)）自小沒(méi )(🏴)了(le )(🗼)母(mǔ )愛。山(shān )叔(🎾)本是(shì )(🌫)一(👋)名鎖(suǒ )(🎲)匠(jiàng )，經營(yíng )一(♑)家(jiā )名(míng )為(wéi )(🚤)《誠(⚫)信(xìn )(🐿)》的鎖(👑)店(🎩)，卻(què )(🗄)因為這(zhè )場(chǎng )意(👁)外(wài )失智(✳)了(le )。他(🛹)隨(🚉)後(hòu )收了(🐖)一位愛(ài )(📞)徒(tú )程(chéng )浩(🥞)仁(🗑)（姜皓(hào )(✖)文飾(😻)）。阿(ā )仁(rén )接(jiē )(🥀)班(bān )了山叔的好(hǎo )(🔊)手(shǒu )(💞)藝(yì )(⏺)，精(🌙)通(tōng )(📎)開鎖(suǒ )(🚣)，甚(shèn )(🥁)至青出(chū )(🚨)於藍(lán )(⏯)。正(zhèng )因為(wéi )(❔)他的(🦗)這(zhè )一(yī )手好(hǎo )(㊗)功夫，經常(cháng )被(bèi )警(jǐng )(🔝)察(chá )找去(🏂)幫忙(🤠)開(kāi )鎖(🌞)的(de )他(tā )(㊙)也(yě )因(yīn )此(cǐ )(🙉)和(hé )警(jǐng )(⛓)探(🎾)劉(liú )業(yè )信（(⛏)黃(🥫)浩(hào )(🤷)然(rán )(👃)飾）(🔔)變成(🤲)了(🕙)好友(yǒu )。至(👺)今(jīn )阿仁(rén )(🤳)從(cóng )(🎋)未(wèi )(🥕)遇見(jiàn )(🐀)他(🧟)開(kāi )不(bú )了(le )(🤖)的(de )鎖。一(yī )直(zhí )到(🤘)有(yǒu )一次(💝)的(de )開(kāi )鎖(suǒ )(🏉)工(gōng )作(zuò )(🍑)中(zhōng )，他(tā )碰(🚗)見(jiàn )(🐾)了(le )(🦇)多年(nián )(🈸)沒見(jiàn )的老友(yǒu )(⛏)李(🐨)全凱(kǎi )（陳(chén )(🃏)沛(pèi )江(💅)飾(shì )(🌼)）。自(📟)此，接二(èr )連(lián )三(sān )的(💿)怪(guài )(🎥)事(shì )(🐡)陸(lù )(🈺)續(🤔)發(fā )(📧)生，阿(ā )(🤥)仁(rén )在(zài )(📛)回(huí )家途(💏)中無(wú )(🥤)意(yì )(🔷)間(jiān )聽見(jiàn )新(xīn )搬(bān )來(lái )的鄰(🔞)居(🏴)關(🚲)小姐(🔎)（黃(🔙)詩(shī )(🌱)棋(qí )(👄)飾(shì )）(🆙)吹起(qǐ )了(le )耳(🔥)熟能(🌸)詳的(⏳)口(kǒu )(🏓)琴(qín )旋律(lǜ )(🍁)。不(👛)曾(🕕)見(😳)過(👗)關(guān )(🎦)小姐(🚻)的(de )阿仁(🐂)開(kāi )始(shǐ )(🛃)對(⏺)關(guān )(👩)小(xiǎo )姐(💅)產(chǎn )(🤼)生(shēng )(❓)好奇並(🕺)偷(tōu )(💑)偷(tōu )(🎴)監(jiān )視(🚤)著(zhe )(🚩)她(tā )(🍹)。與此(cǐ )(❄)同(💁)時(shí )透(⏺)過以靜(jìng )，得(dé )知(🔬)當(dāng )年(🔍)山(shān )嫂(sǎo )的撲索迷(🐱)離案(àn )(💛)，並(bìng )不單(dān )純(🏡)，極有可(🙅)能(🛃)與(yǔ )(🛌)關(guān )(🍾)小(xiǎo )姐(🎞)的(de )(🚓)出(chū )(📯)現(xiàn )(🐇)有(♊)關(guān )(👆)。結果(🍉)阿(🗒)仁(🏆)又(yòu )(🐣)在(zài )(🌒)某(mǒu )次(cì )(🎆)的(de )(⛎)開(kāi )(🏖)鎖工(gōng )作(zuò )(🍈)中(zhōng )撞(zhuàng )見(👔)了(😼)一宗(zōng )(🈺)謀(móu )(♟)殺(🔝)案(àn )(🦐)，因(yīn )(🍏)而被(bèi )劉sir視(shì )(🐑)為(wéi )(🖥)頭號嫌(xián )疑(yí )犯(fàn )(🐼)。
　(👅)　(🏒)究竟阿(🌶)仁(rén )在(🔂)隱(yǐn )藏(cáng )(🍂)著(zhe )什(shí )麼(📳)？(🍐)阿(🚔)仁是不(bú )是(shì )遇(yù )(🚹)見(jiàn )(😓)了一(yī )(🏓)把(bǎ )(⏩)他怎(🔡)麼(me )(🃏)樣(🛫)都解(jiě )(🏫)不(😛)開的(de )鎖(suǒ )？(🍏)那(nà )(➿)首(shǒu )不(bú )(💘)寒(🥖)而(⛄)慄的(🤫)口(kǒu )(😕)琴旋(xuán )(🍆)律(lǜ )，阿凱的(de )(🙇)出(😯)現，山(🕠)嫂(sǎo )(💓)的(de )(🛒)死(sǐ )(🤟)，這(zhè )(💦)把(bǎ )(😫)打(dǎ )(😇)不開(kāi )(🔀)的(de )(🛥)鎖(🐊)到(dào )(😎)底背(bèi )(🧖)後(🌥)捲(juǎn )(❣)入(rù )(🕶)了(🥘)多少(shǎo )人(rén )(🚖)？(👉)警(jǐng )探(♿)劉sir有(yǒu )(🎆)沒(🖨)有機會(🔦)幫(bāng )(🔘)助(zhù )自(zì )(🐊)己(📻)的(🏈)好友(yǒu )擺脫(tuō )(🙋)嫌(xián )(📩)疑(yí )？(👐)難(nán )道(dào )(☔)每(měi )(📧)個(gè )(🐣)人(rén )心中(zhōng )(🤩)真有(😍)一把(bǎ )鎖，每(měi )(⏫)一道(dào )(📦)門的(de )背(⤴)後都(dōu )(👂)有許(🗄)許(xǔ )多多未(🚰)知(zhī )(💻)的(de )故(🐁)事(🏚)在(zài )(🈲)等(děng )(🈶)著(zhe )我(wǒ )們......