纽约女警探凯丽斯特(弗劳伦希娅•洛加诺 Florencia Lozano 饰)18岁那年曾遭遇一场难以忘怀的惨剧,在她生日当天,她的父亲(本尼•尼维斯 Benny Nieves 饰)被蒙面杀手当街杀害,而这一切就在凯丽斯特眼前发生。凶手离开前,将一张写有宗教语句的卡片交到这个惊恐的女孩手里。在此后的13年里,凯丽斯特时时不忘抓到凶手,替父亲报仇。某晚,一名路人被两个蒙面客残忍杀害,凯丽斯特从作案手法和现场留下的卡片看出这两个人正是当年杀害父亲的凶手。沉寂多年的悲愤重新复苏,她不顾上级的命令执意展开调查。在调查过程中,她渐渐得知父亲当年遇害背后的真相,与此同时,她不可避免地和其中一名凶手坠入情网……In New York, Detective Alberto Santana comes with his partner Joseph Bruno to meet his wife Gina and his daughter Celeste to celebrate her eighteenth birthday. Out of the blue, Alberto is shot in his head on the sidewalk by a man wearing a hood that delivers a religious message from the Lord. Many years later, Celeste is a detective of the New York Police Department and partner of Joe Bruno. When the crooks Alden and Jeff Kane, who had torched their buildings to receive the insurance, are released from prison, they are executed by two criminals in the same modus operandi of detective Santana, and the police department concludes that they are the same killers. Lieutenant Diaz assigns Detective Manso and Detective Demarco from narcotics to investigate the case, for the deception of Celeste. Then the drug dealer Chino and his gang are executed in Manhattan's Lower East Side by the killers Dante and his deformed and deranged twin brother Perfecto, and Lieutenant Diaz teams up Joe and Celeste with Manso and Demarco. Meanwhile, Dante meets Celeste in the church and they date first and have a love affair. When Perfecto decides to kill Joe, Dante argues with him but the dysfunctional brother does not listen to him.