Jamie becomes a New York police officer, like four other men in his family. Danny, his brother, solves the kidnapping of a diabetic nine-year-old. The FBI wants Jamie to spy on the Blue Templar, a police secret society.

The Reagans weigh the rights and wrongs of vigilantism when a good Samaritan who has a police record takes action against a terrorizing subway criminal.

Erin, Frank and Danny work together within the system to find justice when a rape case's primary suspect is protected by diplomatic immunity.

Frank mobilizes the entire NYPD to find the killer of a police officer who was murdered after a diamond heist.

A radical, Islamicized American wife is distraught that her divorce has given custody of their son to the father. She hooks a bomb to her car so that the entire family dies. Danny investigates Arabic emails and defuses the situation.

A teenager's party leads to 4 deaths and 1 illness when some of them snort some special powder. Danny takes a sniffer dog to the students' school lockers to solve the case. A teacher's entanglement with a boy student is revealed.

When Erin tries to take down a gang leader via his law-abiding brother, the family debates her methods.

Off-duty Jamie stumbles on a fracas in Chinatown. He chases one of the men, who dies in a car collision. Internal Affairs investigates Jamie and Danny inside Chinatown, finally nailing an illegal adoption racket for Chinese babies.

The life of a Reagan is put in danger when three dangerous criminals are released from prison.

Danny unravels a judge's complicity when he favors a sex trafficker and FBI informant against the mob. Frank gets closure for a case from his policing days of a boy who had disappeared. The boy's remains and a confession achieve that.

When the son of a Russian gangster is killed at his own engagement party, Danny delves into the world of the Russian mob and the family politics that exist. Meanwhile, Erin is thrown into a high-profile corruption case.

An undercover cop, who had infiltrated a terrorist cell, is shot. A girl, with acute anxiety and living alone, frequently complains that her house furniture has been disturbed. Danny solves the shooting and Jamie apprehends the intruder.

When a young girl is tied up, gagged and held for ransom, Danny and Jackie place her drug-addicted boyfriend at the top of their suspect list. Meanwhile, Erin and her boss, Charles Rossellini, take their flirtatious banter a step further.

When an assassination attempt is made on Frank's life, Danny goes on a hunt to track down the shooter and find out if the attack was random or by someone with a vendetta against the Commissioner.

Nicky, Erin's daughter, writes a school paper on policing, and is upset when she sees a real dead body. Danny solves that murder. Jamie apprehends an art student who sprays art work on walls and shop shutters. He is let go with a warning.

A much decorated, awkward and homeless Marine gets beaten to death by 3 cavalier, rich guys in a back alley. Danny, an ex-Marine, is distraught by the outrageous act. After a difficult investigation, he succeeds in solving the case.

When Linda's runway model niece and another model collapse at a fashion show, Danny and Jackie immerse themselves in the cut-throat world of fashion to find the culprit who poisoned them.

When a tourist from Iowa who is visiting the city with his wife gets mugged and shot, the press soon puts the pressure on the police to solve the case fearing for New York's reputation with tourists.

An elderly couple known to the Reagans is murdered in their house in the neighborhood, Jamie's service weapon gets stolen from his locker and Frank fights the mayor about the police budget.

A married, family man and supporter of the new Mayor, involved with a Croatian girl, is shot dead. The Mayor is averse to bad press. Frank stays on as Commissioner. Plain-clothed Jamie unknowingly helps a mob member who had over-dosed.

When a bank robbery turns into a hostage situation, Frank realizes that the perp is a former cop and old friend who has resorted to crime because of his daughter's desperate illness.

Erin reopens an 18-year-old rape case in which Frank was the arresting officer. Meanwhile, Danny and Jackie investigate the murder of three teenagers in a park who seemed to have been killed for no reason.

Frank deals with a political crisis after Jamie and Renzulli enter a religious center in response to a 911 call and are injured by the church's security team who prohibits them from entering.

A girl falls from her apartment window and dies. Danny investigates. Henry has a heart attack and spends Thanksgiving in the hospital. Tony gets cash to square off his gambling debt, with a warning from the Commissioner.

A whistle blower and Erin's confidential informant is killed. Danny investigates and a personal angle to his killing is unearthed. Frank exposes an edited video which was disparaging towards the police force.

Danny and Jackie investigate a murder scene at a diner where a witness claims a uniformed officer fled the scene after shots were fired.

An undercover operation is underway to trace a drug pipeline. Two detectives get shot, killing one. Danny investigates along with the entire police force, out to avenge the killing. Nicky and Henry dance and sing in a show.

Jamie saves a baby from an apartment fire but Renzulli gets the credit so that his cover remains intact. A fireman's 11-year-old son, a school friend of Danny's son, feels that his father did not commit suicide. Danny investigates.

The police come to know of a citywide biological threat and Frank deals with it. Danny, hunting for a petty thief, gets a tip which helps resolve one of his unsolved cases. Jamie and Danny argue about booking rights for this petty thief.

A dangerous criminal from Danny's past comes back to seek revenge and kidnaps Jackie. Meanwhile, Jamie meets his new partner. Michael Madsen and Corbin Bleu guest star.

Danny and Jackie set out to investigate the murder of a bride on her wedding day in a drive-by gang shooting. However, they are pulled off the case and assigned to the protection detail of a Central American president who they believe is a target for assassination.

Danny is investigating the shooting of a man who's an ex-con, and there's a lot of people who wants to see him dead. The man dies in the hospital and he asks for a priest to give him the last rites. Danny learns of this and asks the priest to tell him what the man said but the priest refuses to say anything. A known criminal lawyer Frank knows gives him some information but Frank is not sure if he should believe the lawyer. And Henry is mugged and Jamie is determined to find the one who mugged him.

Jamie must deal with the emotional consequences of his actions on the job. Susie Essman and Annabella Sciorra guest star.

The body of a girl is found in the cemetery laid out as if she was being prepared for burial with a cross in her hands. Danny investigates and talks to her father, who says she's a very devout Catholic girl. But when they talk to her friends they discover that she's keeping secrets from her father. Frank learns that a former NYPD cop shot two cops in Miami, killing one of them after being rejected. It seems like the cop was fired from the NYPD. And Frank fears that he might be coming to New York to go after the ones who go him booted from the Force.

Danny gets a call to go to a project where a gang rules with fear and intimidation. Jamie finds a girl standing on the roof holding her baby, saying she can't stand their lives being controlled by street gang Los Lordes so she jumps to death with her baby. Danny later learns that the girl was someone he met when she was younger when her parents died and he said he would help her and her sister. Danny goes to her sister who is bitter that Danny forgot about them. He learns that she is now with the leader of the gang. While Jamie and his partner are walking through the project there's some shooting and Jamie's partner is hit. Frank later learns that the D.A. is not pressing to prosecute the gang so Frank goes to the mayor for help.

As the Reagans rally together to take down the leader of the gang responsible for the murder of someone close to them, Danny looks to the gang leader's girlfriend to lead them to him.

When a famous movie star, Russell Berke, who shadowed Danny for research on his next role, is stabbed, Danny goes to his aid, but must keep the crime on the down-low due to Russell's celebrity status. Marc Blucas guest stars.

Baez gets injured while escorting confiscated drugs, so Danny goes after the drug cartel responsible. Elsewhere, a lieutenant with a commendable record engages in controversial behavior, putting Frank in a difficult situation.

A mobster is found shot in his car and his low-level errand boy is tied up in the trunk; an NYPD officer asks for a new shield number -- the same number as Frank's deceased son Joe.

Nicky, Erin's daughter, writes a school paper on policing, and is upset when she sees a real dead body. Danny solves that murder. Jamie apprehends an art student who sprays art work on walls and shop shutters. He is let go with a warning.

A mobster is found shot in his car and his low-level errand boy is tied up in the trunk; an NYPD officer asks for a new shield number -- the same number as Frank's deceased son Joe.

Jamie saves a baby from an apartment fire but Renzulli gets the credit so that his cover remains intact. A fireman's 11-year-old son, a school friend of Danny's son, feels that his father did not commit suicide. Danny investigates.

The body of a girl is found in the cemetery laid out as if she was being prepared for burial with a cross in her hands. Danny investigates and talks to her father, who says she's a very devout Catholic girl. But when they talk to her friends they discover that she's keeping secrets from her father. Frank learns that a former NYPD cop shot two cops in Miami, killing one of them after being rejected. It seems like the cop was fired from the NYPD. And Frank fears that he might be coming to New York to go after the ones who go him booted from the Force.

Danny is investigating the shooting of a man who's an ex-con, and there's a lot of people who wants to see him dead. The man dies in the hospital and he asks for a priest to give him the last rites. Danny learns of this and asks the priest to tell him what the man said but the priest refuses to say anything. A known criminal lawyer Frank knows gives him some information but Frank is not sure if he should believe the lawyer. And Henry is mugged and Jamie is determined to find the one who mugged him.

Frank deals with a political crisis after Jamie and Renzulli enter a religious center in response to a 911 call and are injured by the church's security team who prohibits them from entering.

An elderly couple known to the Reagans is murdered in their house in the neighborhood, Jamie's service weapon gets stolen from his locker and Frank fights the mayor about the police budget.

When Erin tries to take down a gang leader via his law-abiding brother, the family debates her methods.