一名官司胜率10%的生计型律师被卷入偶然承接的命案当中，一夕之间成了旷世天才诈骗犯“大老鼠”。为了保命并守护家人，他将揭发算计着滔天阴谋的特权阶层真面目。

22年前双胞胎兄弟宇信和秀玄因一起命案失去了父亲。如今成为畅销推理小说家的宇信发现被用来杀害他父亲的凶器是一支名为阿达玛斯的钻石箭，为了得到它，他以自传代笔作者的身份进入了海松集团权宰圭会长的宅邸。而成为中央地检特搜部检察官的秀玄则和试图揭开22年前真相的记者瑞熙见了面，并对父亲的死产生了怀疑，开始重新追查这起案件。双胞胎兄弟俩将以各自的方式追查案件的秘密并揭开真相。

Dark Minds brings together the sharp criminal minds of author and investigative journalist M. William Phelps and pre-eminent criminal profiler John Kelly to reopen unsolved homicides thought to be the work of serial killers. They are assisted in their efforts by a source known only to viewers as "13," a convict serving multiple life terms for a series of murders, who presents his theories about potential motivations behind these chilling cold cases based on his own experiences. They bring fresh eyes to unsolved serial killer investigations using the combined instincts of three unique perspectives, with hopes that it will encourage viewers to bring forward new leads.