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.
Frank is put in a tough position when a supporter for the mayor-elect is found dead; Jamie goes on his first undercover assignment at a bar.
Danny is put on modified assignment and must deal with an Internal Affairs investigation after he shoots a police officer who fails to identify himself.
When a bank robbery turns into a hostage situation, Frank realises that the perpetrator is a former cop who has resorted to crime due to his daughter's desperate illness.
Erin reopens an 18-year-old rape case in which Frank was the arresting officer. Danny and Jackie investigate the seemingly motiveless murder of three teenagers in a park.
Danny tries to balance work and romance, and Jamie goes deep undercover within a crime family.
Jamie and Renzulli attend a religious center in response to a 911 call and are injured by the church's security team, precipitating a diplomatic crisis for Frank.
Jackie senses a pattern when an escort is murdered in a hotel room, and poses as a decoy escort. Henry declines a role in a private agency looking to profit from outsourcing in NYPD.
Danny investigates the death of a girl who falls from her apartment window. Henry spends Thanksgiving in hospital, and Tony gets cash to square off his gambling debt.
Jamie goes undercover selling stocks on cold calls in order to secure a client list with criminal links. Danny drives around a convicted mobster in a deal to help his carjacking son.
A whistle blower and Erin's confidential informant is killed. Danny investigates and a personal angle to his killing is unearthed.
Danny and Jackie investigate a murder scene at a diner where a witness claims a uniformed officer fled the scene after shots were fired
After Danny bumps into a man, shots are fired, and they miss hurting his family. At a wake, Frank speaks about his partner who went on disability after saving more than 100 people from the North To...
A woman is found dead - the daughter reports a murder while her step father reports a death. Frank's support is sought for the canonisation of a priest of his parish.
Nicky gets a reality check when her absent father shrugs her off. After an illegal immigrant is robbed of his cash, his son accidentally kills the thief.
Two detectives get shot during an undercover operation to trace a drug pipeline - one fatally. Nicky and Henry dance and sing in a show.
A journalist and Frank's secret girlfriend survive an acid attack. A member of the mob, who is in charge of the stocks' operation, is killed. Jamie, undercover, falls under suspicion.
During a murder trial, another murder takes place and Danny finds himself pitted against Erin in the courtroom. Frank's onyx credit card is misused after fraudulent duplication.
Following a gun buyback plan - with no questions asked - a gun used in a shooting is traded in. Danny investigates without being able to use the evidence from the buyback programme.
Jamie saves a baby from an apartment fire but Renzulli gets the credit so that his cover remains intact. Danny investigates the apparent suicide of a fireman.
Erin's witness in the murder trial of a violent mobster is killed before giving testimony. Due to a leak, the next witness is threatened. Erin is offered the Deputy Mayor's position.
A man dies in the reception area of a hospital, leading to an illegal fight club with heavy betting. Jamie's cover is blown, and he saves Noble from a mob hit.
The police discover a citywide biological threat. Danny, hunting for a petty thief, gets a tip which helps resolve one of his unsolved cases. Jamie and Danny argue about booking rights.