警署警長方梓翹阻止少女梁敏詩在酒吧鬧事，被敏詩誤傷。敏詩與同學何欣遙起爭執，沙展高輝出面調停。高輝事業不順，獲扁瓦爐火鍋店老闆娘盧倩雯安慰。敏詩伏屍後巷，疑因過量吸毒致死。高輝被調派到梓翹所屬的重案組，二人往敏詩就讀的學校調查。欣遙在母親唐淑慧陪同下作供，道出敏詩做援交一事。敏詩的父母早已離異，梓翹指責她的父親未有依時給予贍養費。敏詩的父母在天台爭執，敏詩之母企圖跳樓，高輝、梓翹趕來阻止……

林偉倫見女友梓翹受傷，勸梓翹辭職，並帶同兒子何子俊隨他移居上海。高利貸到扁瓦爐追債，侍應程國彪阻止不果，向高輝求助。高輝、梓翹找到敏詩的援交客人張允賢，允賢道出案發當晚的經過。高輝發現敏詩的交友帳號被刪除，懷疑與欣遙有關。高利貸再次上門向倩雯追債，被收數公司老闆羅威阻嚇。倩雯的女兒盧小寶是KOL，她為拍片吸引網民，向高輝打聽敏詩一案。淑慧停用家中的無線網絡，欣遙匆匆離家，並聯絡毒品拆家食腦……

食腦駕車逃走，高輝舉槍阻止……欣遙向警方坦白與敏詩做援交一事，對其離世甚感自責，但淑慧仍有信心為欣遙洗脫罪名。高級督察湯玉蘭懷疑案件另有內情，梓翹向玉蘭投訴高輝的辦事手法有問題。老師發現子俊持有香煙，子俊拒絕透露香煙來源；在梓翹逼供下，子俊的同學承認違規，但事後責怪子俊出賣朋友。高輝到酒吧索取閉路電視片段，被負責人劉樂基拒絕。羅威找郭明生追債，樂基答允代手下明生承擔債務。羅威遇上小寶，尾隨在後……

小宝在街头拍摄李文杰遛狗，被文杰要求删除影片。罗威向倩雯提议让小宝加入他的公司。高辉从小宝拍摄的影片找到线索，再次调查允贤。允贤道出事发经过，梓翘情绪激动。高辉带梓翘找小宝，让梓翘观看涉案影片，小宝暗中直播梓翘工作的模样。罗威与手下翻啄跟踪食脑，打算要胁乐基。罗威向小宝打听案情，却被小宝看出他有所隐瞒。罗威拒向高辉透露食脑的下落，倩雯亲自往找罗威……梓翘得悉曾被小宝偷拍，要她立即删除影片。

食脑被捕，但他否认谋杀敏诗……伟伦来电提醒梓翘着手准备移居上海，梓翘借词回避。高辉、梓翘探望敏诗的家人，敏诗的母亲提供一段留言录音，令案件出现新疑点……子俊见友人张明朗与小混混争执后被殴打，即出手阻止。子俊、明朗到游戏开发公司试玩新游戏，老板文杰欣赏子俊的态度，有意聘请他担任游戏试玩员。明朗游说子俊别上班，还带子俊等人喝酒，子俊拒绝并离开。小宝为拍片接近明朗，惟明朗接到一通电话后匆匆离去……

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