The “Death Investigation Extension (D.I.E.)” in the police force was established to accommodate those who have been sent away by their supervisors. As everybody knows, members of the Extension are to investigate unsolved cold cases. YUE CHI-LONG (Roger Kwok Chun On), who has cracked a large number of difficult cases by extrasensory means, is assigned to the D.I.E. believing that he will get promoted soon. Later LONG finds out that his supervisor still has a long way to go before he reaches retirement age. Hoping to leave the Extension as soon as possible, he gets to solve a lot of intriguing cases. New appointee YING CHING-CHING ( Sonija Kwok) is a good-looking girl but she means to act tough and sassy in front of others. She takes an uncompromising stand over every case she deals with, which leads her into constant quarrels with LONG. The relationship between the pair is deteriorating day after day.
LONG’s elder sister, YUE CHI-CHING (Margie Tsang Wah Sin), has been living with him. While investigating an old case, LONG gets to find his long-lost father YUE TAI-HOI (Bryan Leung Ka Yan). Through close collaboration with LONG, CHING-CHING has gradually developed affection for him. As she is still torn between LONG and her two-timing boyfriend SHING KA-TSUN (Kenneth Ma Kwok Ming), LONG has started to try to avoid her without rhyme or reason. Feeling so confused about what is happening, CHING-CHING decides to do some probing and is shocked to discover that LONG has been dogged by a female ghost called SIU SIN ( Kitty Yuen)…

通靈力量破奇案鬥氣冤家爭上位
于子朗為一精明幹探，一次查案過程之中，子朗頭部遭到重擊，竟因而得到一種通靈感應，憑著此種神奇力量屢破奇案。子朗於偵查一宗兇殺案後，令上司對他懷恨在心，於是將他流放到「特別兇案調查分部」，更謊稱該分部之負責人費格遜行將退休，日後會由子朗接任其職。子朗赴任後發覺此分部之成員，盡是一些騎呢之輩，更與稍後到任之刑晶晶結成鬥氣冤家。刑晶晶不想被人視作花瓶看待，刻意扮成粗聲粗氣，作風勇悍，因而經常闖禍，遭受各方投訴，最終被上司流放到「特別兇案調查分部」。晶晶也以為只要等到費格遜退休，便可接任其職，於是忍辱負重，帶同下屬張正義一同赴任，因而與子朗產生明爭暗鬥。

男友移情別戀冤家變成拍檔
晶晶因過於熱衷於查案工作，與身為重案組高級督察的男朋友成家雋疏於見面，二人之間距離漸遠。剛巧，城中知名電視台新聞女主播卓琪訪問家雋，卓琪更主動向家雋投懷送抱，家雋一時把持不定，竟背著刑晶晶與卓琪暗中來往。其後，家雋在卓琪壓力下，向晶晶提出分手，晶晶大受打擊，意志消沉。子朗以激將法令晶晶放開懷抱，重燃鬥心，二人更因而成為最佳拍檔。

父涉兇殺案姐墮愛情陷阱
子朗於偵查一宗十多年前之兇殺案時，竟遇上其失蹤父親于大海，子朗認定大海當年拋棄妻兒，堅決不肯與其相認，及後驚悉大海竟是自己正在偵查的那宗懸案之殺人疑兇……
于子晴多年來為了照顧弟弟于子朗，蹉跎了青春歲月。子朗與子晴之細姨簡緻美年前自外國返港，藉著離婚得來之贍養費，經營婚姻介紹所，更找來子晴作助手。子晴因工作關係，認識了婚姻介紹所一單身貴族熟客，不慎掉進愛情陷阱之中……

女鬼纏身情路多波折
子朗勇於辦案之餘，感情路上卻不大順利，一直以來，身邊女友竟無人能與其交往多於一個月，凡與其約會多過三次之女友，皆會遭逢橫禍。子朗認定有人在背後破壞，於是與晶晶假意拍拖，企圖引出幕後搞鬼之人，不料因此互相生出微妙感覺，並引出女鬼小宜……
小宜要求返回陰間前上一次晶晶的身，一嘗拍拖滋味，誰知陰差陽錯，竟幾乎令晶晶死於浴缸之內。小倩離去前警告子朗，若然他與晶晶走在一起，最終會害得晶晶死於非命，令剛對晶晶產生愛意的子朗因而卻步……

情敵涉嫌謀殺三角關係糾纏不清
緻美的女兒，也是家雋的侄女返港，經常破壞母親相睇好事，其後不堪被緻美斥責，離家出走。卓琪遭槍殺，家雋涉嫌謀殺，其侄女被發現在兇案現場的客房內，並因過度驚嚇而癡呆。家雋請求晶晶幫忙洗脫罪名，不料子朗找到更多證據指控家雋殺人，開始懷疑家雋是否真的無辜……
此外，家雋重新追求晶晶，時因晶晶早已對子朗產生感情，大感矛盾，子朗冷眼旁觀，又擔心自己最終會害死晶晶，決意退出這個三角關係……

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