After his girlfriend died in a car crash, sorrowful psychologist Chung Tai Yin spends five years investigating the truth of the incident. His girlfriend once conducted a psychological assessment for a schoolyard murderer. Her report indicated that he lacked a motive or violent tenancies. During the course of his investigation, Chung Tai Yin meets Tung Yat, a genius with Asperger syndrome, and his sister Tung Yuet, whom he is mutually dependent with. Tung Yat's lack of social skills gives Tung Yuet a lot of trouble. Many yearsago, it even caused police officer Wu Tin Yeung's undercover mission tofail. But because of Chung Tai Yin, they eventually become friends and help Chung Tai Yin with finding the true killer. Wong Hoi Ching, a witness in the case who could not be contacted for many years, suddenly appears and visits the murderer in prison, causing drastic changes in the case...

善惡在乎人心，愛恨有時只差一線
竭力追求真與善的人，偏偏將自己推進漆黑的深淵。

心理學家執迷緝兇

鍾泰然(馬國明飾)擁有臨床心理治療的專業資格，善於解讀、分析、引導人心。五年前，一所大學發生駭人命案，兇手盧健強(韋家雄飾)即時被補，判處終生監禁。事件看似告一段落時，曾在血案前替健強進行心理評估的曾秀怡(湯洛雯飾)，竟被人用車撞死，原來命案的死者父親認為秀怡放生健強，蓄意報復。

泰然驚聞女友秀怡的噩耗，傷痛欲絕。他反覆研究健強的心理報告，認為秀怡沒有失職，而個性單純的健強更沒可能擁有殺人傾向。執着的泰然相信兇案別有內情，於是決定替女友「翻案」，揪出元兇！

自閉天才&過氣幹探　鬥氣查案

泰然在調查線索期間，接獲法庭命令，替患有輕度自閉(阿斯伯格綜合症)的童日(楊明飾)做心理治療。泰然發現童日雖然率性自我，但智商極高，遂慢慢引導童日改善社交障礙。

適逢漁販梁志峰(湯鎮業飾)的大兒子失蹤，更牽涉一宗少女謀殺案。泰然本來只為處理求助個案，了解志峰的家庭問題，卻恰巧發現童日居然能與志峰的高智商小兒子溝通，找出大兒子失蹤的因由及兇案線索。

督察胡天揚(敖嘉年飾)從破案過程中見識到泰然的專業，邀請他日後協助偵查案件，但同一時間卻對童日針鋒相對！原來三年前童日傻頭傻腦地破壞了天揚的臥底行動，還害他腳部重創，毀了對方在警隊的大好前程。泰然眼見二人水火不容，希望藉着帶童日查案，醫治他處理人際關係的種種毛病。

熱心社工&網媒主持　藏破案關鍵

童日協助警方破案的事跡，吸引網媒主持汪海澄(王君馨飾)的訪問邀約。泰然得悉海澄是當年校園命案的唯一倖存者，計劃借機接近海澄，尋找兇案真相。可惜海澄對案發過程猶有餘悸，拒絕重提陰影。泰然只好利用心理學的知識，逐步剖開海澄的心房……

過程中，泰然又發現童日那位任職社工的妹妹童月(蔡思貝飾)，居然是將昔日真兇繩之於法的關鍵人物。他決定借助童氏兄妹的力量，與兇手展開一場鬥智鬥力的心理戰……

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