In the aftermath of Catherine's suicide, Detective John Cardinal outwardly accepts the evidence that she took her own life, but when he starts to receive taunting greeting cards blaming him for her death, he begins to question the suicide.
《冰血缉凶第三季》以呈现出青年追梦人正向的人生价值观为主线,描写他们经历灵魂炼狱般的残酷青春成长故事为主题,本剧惊险玄疑,将敌我错综、正邪难辨的斗争淋漓尽致的展现出来,同时非常专业,人物的形象刻画非常立体,主演不惜牺牲自己保护战友的崇高纯洁的节操,观众有一种心理上的紧张和刺激。