詹姆(威尔·埃斯蒂斯 Will Estes 饰)出生于警察世家,他的父亲弗兰克(汤姆·塞立克 Tom Selleck 饰)是现任纽约市警察局局长。身为家中最小的孩子,詹姆无疑是全家人的希望和骄傲,从哈佛法学院毕业之后,本可能成为一名成功律师的他毅然决定遵从父亲的意愿,穿上警服,成为执法界的一员。 来自上级的一个任务让詹姆陷入了困惑之中,他被安排成为一名卧底警察,参与一桩十分危险的要案。詹姆的卧底身份是如此的隐秘与重要,以至于弗兰克即便身为局长,也对此一无所知,面对这个有可能改变他一生的选择,詹姆该何去何从?他和家人,以及女友西德尼(Dylan Moore 饰)之间的关系又会因此而发生怎样的改变呢?Blue Bloods follows the lives of the NYPD's First Family of Law Enforcement: the Reagans. Frank, the Police Comissioner and son of former PC Henry Reagan, must balance his duties of running the largest police force in the world and being his kids' boss. His daughter Erin is an Assistant District Attorney, son Danny is a senior detective and fellow Marine Veteran, and new Harvard Law grad turned cop, Jamie all swirl through this family drama and passionately defend their city from harm. The Irish-American family is deeply rooted in their patriotism, passion, and love of family.