该剧改编自清闲丫头所著同名小说。故事延续第一部的剧情，讲述三法司少年团联手“攘外”，将一个个看似毫无关联的案件抽丝剥茧、扎根串联，护百姓安宁，更守家国平安的故事。
该剧是一部犯罪惊悚剧，讲述患有反社会性人格障碍的有名女法医的过去，以及杀死自己的父亲的影子威胁她的名誉和生活的过程。姜勋饰演相信人类本质是善良的人文主义警察郑正贤一角，对破案充满热情的人物，与具有反社会性人格障碍的法医交织在一起。
In the small village of St. Mary Mead, Colonel and Mrs. Bantry, owner of the local manor - Gossington Hall is shocked when one morning a young lady's body is found in the library. They call in the police who soon run up against a brick wall, only finding out that the body is that of a dancer in London who the Bantry's didn't even know. But how and why was her body left in the library? To find out the truth, the Bantry's call in the help of their good friend and detective - Miss Jane Marple.
