(🕕)一宗(zōng )(🌠)離奇(qí )失(shī )蹤(⛲)案(àn )，讓(ràng )山(shān )(📼)叔(shū )（許(xǔ )(🐌)紹(🍩)雄(🔼)飾(🌰)）痛失了(🕟)愛(ài )(🕸)妻(qī )山(shān )(🔱)嫂(sǎo )(🕰)，也(yě )讓(ràng )張(🎺)以靜(jìng )(🎗)（(🎹)高(gāo )海(🥈)寧(🐉)飾(shì )）(🌰)自(zì )(🍖)小沒(🏴)了(le )(🗼)母(mǔ )愛(🥩)。山(shān )叔(🎾)本(běn )是(shì )一(yī )名(míng )(⏬)鎖匠(jiàng )，經(jīng )(🌗)營一(yī )(♑)家(jiā )名(míng )(😎)為《誠信(🐿)》的(de )鎖店(diàn )(🎩)，卻因(yīn )為(wéi )這場意(yì )(👁)外(wài )失(shī )(💆)智了(le )(🔲)。他隨(suí )(🚉)後收(shōu )(🚥)了(le )一(yī )位(wèi )(🛺)愛徒程浩(hào )(🥞)仁(🗑)（(😚)姜(jiāng )皓(hào )文(🙁)飾(😻)）。阿(ā )(🚑)仁接(🥀)班(bān )了(le )(🤯)山(shān )叔(shū )(🐖)的(🤷)好(🔊)手(💞)藝，精(jīng )(🌙)通(📎)開鎖(🚣)，甚(shèn )至青出(chū )(🚨)於(🛑)藍(⏯)。正(zhèng )因(yīn )(🔢)為(wéi )(❔)他的(de )這(🌑)一手(shǒu )好(㊗)功(🥎)夫，經(jīng )常(cháng )被(bèi )警(🔝)察(✋)找(🐑)去(🏂)幫忙(máng )(🤠)開(kāi )(🤸)鎖(suǒ )的(de )他(㊙)也(👓)因(yīn )此(cǐ )(🙉)和(💪)警探(tàn )劉(⏰)業(yè )(🈴)信(🍄)（(⛏)黃(huáng )浩(hào )(🤷)然(rán )(👃)飾(shì )(🧤)）(🔔)變(biàn )(🚻)成(chéng )了(le )(🕙)好(hǎo )友。至(👺)今(⛳)阿仁(rén )(🤳)從(🎋)未(wèi )遇見(jiàn )(🐀)他(tā )(🧟)開不(bú )了的鎖。一(👣)直(🗳)到有(yǒu )一(yī )(❕)次(cì )的(💹)開(kāi )(💔)鎖(🏉)工(🥊)作中(👊)，他(💍)碰(pèng )(🚗)見了(le )多(duō )(😊)年沒(méi )見(jiàn )的老(🌹)友李(lǐ )(🐨)全(👪)凱(🥋)（陳沛(pèi )江(jiāng )(💅)飾）。自(📟)此(cǐ )，接二(🔈)連(lián )(🏒)三的怪(guài )(🎥)事陸(lù )續(xù )(🤔)發(📧)生(🔍)，阿仁(⏲)在(zài )回(🔤)家(jiā )(👌)途(💏)中無意(🔷)間聽(tīng )(♌)見(💸)新(🥅)搬來(lái )(🍽)的(de )鄰(lín )居(🏴)關(guān )小(📐)姐(jiě )(🔎)（(🌂)黃(🔙)詩棋飾(🐖)）(🆙)吹(🖍)起(🔫)了(le )耳(ěr )(🔥)熟(shú )能(néng )詳(xiáng )的(de )口(kǒu )(🏓)琴(qín )旋律(lǜ )(🍁)。不(👛)曾(🕕)見(jiàn )過(guò )(👗)關(🎦)小(xiǎo )姐(jiě )(🚻)的(de )(🍺)阿(ā )仁(🐂)開(kāi )始對(duì )(⏺)關(guān )小(xiǎo )姐(💅)產(chǎn )生好奇(✖)並(🕺)偷(💑)偷(tōu )監(😉)視(shì )著(zhe )她。與(yǔ )此(cǐ )同(tóng )(💁)時透過(guò )(🧥)以靜(jìng )，得(🐈)知(zhī )當(🍯)年山嫂(💕)的(de )(🈂)撲索(🐌)迷(mí )(🐱)離(lí )(🖱)案(àn )，並不單(dān )純(chún )(🏡)，極(jí )(💨)有(yǒu )可(kě )(🙅)能(🛃)與(🛌)關(guān )小(xiǎo )姐(jiě )的出現(xiàn )(🐇)有(yǒu )(♊)關。結(jié )(🏗)果阿(ā )(🗒)仁又在某(mǒu )(🎁)次的(de )開(🏖)鎖(suǒ )(🍝)工(🐸)作(zuò )(🍈)中撞(zhuàng )見(👔)了一宗(zōng )(🈺)謀殺(🔝)案(àn )(🦐)，因(yīn )(🍏)而(😻)被(bèi )(♈)劉(liú )(⏭)sir視為頭(tóu )號(hào )(😙)嫌疑(yí )(👧)犯。
　(👅)　(🏒)究竟阿(ā )仁(rén )在(zài )(🔂)隱(🔰)藏(cáng )著(zhe )什(shí )(🌸)麼(me )？(🍐)阿仁是(shì )不(👎)是(shì )(❗)遇(yù )見(😓)了(le )一(yī )(🏓)把他(tā )(🤳)怎(🔡)麼樣(🛫)都(dōu )(📛)解不(bú )開(kāi )的鎖(🦀)？(🍏)那(nà )(➿)首(shǒu )(🤙)不寒而(ér )慄(📒)的(de )(🤫)口(kǒu )琴(🎛)旋律(💽)，阿(ā )凱(🔭)的出(chū )(😯)現(🆕)，山嫂(sǎo )的(de )(🛒)死(sǐ )(🤟)，這把(bǎ )(😫)打(😇)不(bú )開(🔀)的(de )(🛥)鎖到底(dǐ )背(bèi )後(hòu )(🌥)捲入(rù )(🕶)了(le )(🥘)多少(shǎo )人(rén )？(👉)警探(♿)劉(🚞)sir有(🎆)沒(méi )有(yǒu )機(🐔)會(huì )(🔦)幫(bāng )助(zhù )(🚬)自己的(🏈)好友(yǒu )擺(bǎi )(🍩)脫嫌(xián )疑(Ⓜ)？難(💙)道每(měi )(📧)個人(rén )(🚹)心(🚄)中(zhōng )(🤩)真有一(yī )把(bǎ )(🤯)鎖(📒)，每一(yī )(🙎)道(dào )門(mén )的(de )(🎁)背(⤴)後(hòu )(🛺)都(dōu )有(yǒu )許(🗄)許(xǔ )(🌻)多多(duō )(🎅)未(wèi )知(zhī )的(de )(🈹)故(gù )(🐁)事在等(děng )(🈶)著(zhe )(🎦)我(🍑)們(men )(🐞)......……