
Tom Selleck stars as Frank Reagan, the New York Police Commissioner, and patriarch of the Reagan clan, a multigenerational family of cops. Frank's oldest son is Danny, a seasoned detective and Iraqi War veteran who occasionally uses dubious tactics to solve cases. Daughter Erin, the lone female, is an assistant district attorney. Fresh out of Harvard Law, Jamie is the youngest member and "golden boy" of the family. Jamie gave up a lucrative future in law to continue the family's tradition in police work, and is asked to participate in a secretive investigation that even his father does not know about.
A homeless teenager claims his aunt was murdered by her boyfriend; Erin is replaced on a case involving a corrections officer.
When a homeowner shoots an intruder, surprising information is revealed; Erin starts to doubt herself when a 12-year-old case is reopened.
A resident of the low-income section of a luxury apartment building is murdered; Frank is upset with a detective who takes advantage of legal loopholes.
Erin must bring a mob informant back to New York to help with a case after losing her star witness; Frank and Mayor Poole debate about police officer benefits.