After a young girl goes missing, the family argues whether Danny used questionable methods in order to bring her home safely. Meanwhile, Jamie graduates from the police academy and begins his new life as a cop
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
An off duty cop is found dead after a diamond heist and Frank gets the whole police force in gear to find the murderers.
The Reagans argue the pros and cons of profiling as Frank, Danny and the rest of the NYPD search for a bomb that is about to detonate in Manhattan.
Danny works to discover the source of a deadly narcotic after three teenagers die from a drug overdose.
When Erin tries to take down a gang leader using his law-abiding brother as bait, the family debates her methods.
After meeting with federal agents in a dark edge of Chinatown, Jamie witnesses a crime in progress and his suspect is killed while in pursuit. Now, Danny must solve the case in order for Jamie to avoid an Internal Affairs investigation.
The life of a Reagan is put in danger when three dangerous criminals are released from prison.
When a doorman at a New York City hotspot is murdered, Danny returns to investigate the nightclub scene he left behind years ago. Meanwhile, Frank makes a decision about an ex-partner's future.
Danny and Jackie investigate the murder of a high-end escort found floating in the river. Meanwhile, Frank vows to bring a killer to justice when a missing boy's remains are found from a case that he was emotionally invested in 25 years ago.
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.
When an undercover counter-terrorism agent is shot, Frank assigns Danny to the case because he is the only officer he can trust given the victim's involvement with infiltrating a sleeper cell; however, Danny is sworn to secrecy as to not disrupt the police activity in that cell
When a young girl is kidnapped 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.
When an unidentified young girl is found murdered at a debutante ball, Danny and Jackie look to the prostitute found giving her a hard time on the hotel's surveillance camera for clues. Meanwhile, Nicky gets a glimpse of her first murder victim as she rides along with Danny when he gets the call to investigate.
When a former U.S. Marine and war hero-turned-homeless man is found murdered, Danny, a former Marine himself, feels a personal connection and is determined to find the killer. Meanwhile, erroneous information about Frank running for mayor is leaked to the press.
While stopping at a Deli in Harlem after a lateshift, Danny is the eyewitness to a murder. Danny is able to identify the killer, Raymundo Salazar, a Peruvian drug lord. The victim, David Taylor, is simply a local school teacher but Danny learns was in a relationship with Salazar’s girlfriend Sylvia. Lyle Greene, the Special Narcotics Prosecutor tells Erin, Danny and Jackie Salazar has been difficult to prosecute, with limited evidence and a history of intimidating and killing witnesses. Danny is confident that he can take Salazar down with his testimony and has him brought into police custody. Given Salazar’s reputation, Danny has his family taken into police protection but Salazar’s men disguised as detectives pick up Linda at their home and kidnap her. With Linda now kidnapped, they attempt to stop Danny from testifying and he is determined to find her. After Sylvia’s dead body is found in one of Salazar’s vehicles, they are able to trace the tricked out car to a specific detailer who is able to give them information where the SUV was originally delivered. They raid the houses in Harlem crawling with Salazar's crew and Danny finds Linda, tied up in the basement and scared, but unharmed. Shortly thereafter, just as Greene is telling the court that Danny is a no-show, Danny enters the courtroom to testify. Frank and Baker arrest Lyle Greene after discovering evidence that he has been on Salazar’s payroll to keep him out of jail, until now.
When Linda's runway model niece and a reporter both 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 is shot outside a hip Lower East Side restaurant, the media sensationalizes the murder, much to Frank's frustration.
When a family down the street from the Reagans is murdered, their drug- and alcohol-addicted son is the prime suspect. Meanwhile, when Jamie's gun goes missing, he is convinced he's being set up for pursuing the Blue Templar.
When a drug bust points to dirty cops, Frank decides not to involve Internal Affairs in the hopes of taking down and exposing the Blue Templar.
When a supporter for the mayor elect is found dead, Frank is put on the spot. Tony Bennett and Carrie Underwood guest star.
When Danny shoots a cop who failed to identify himself, he is put on modified assignment and must face an Internal Affairs investigation, which delves into his personal state of mind that day.
When three men attempt to rob a bank, Danny discovers that one of the perps happens to be a former cop. Meanwhile, Jamie works with a new partner, Luisa Sosa, on 'Bingo Bag' duty.
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.
Danny tries to juggle investigating a case with trying to have a romantic weekend with Linda. Meanwhile, Jamie goes deep undercover into a crime family.
Frank deals with a political crisis after Jamie and Renzulli are injured by a church security team that refuses to let them enter a religious center in response to a 911 call.
Jackie goes undercover as an escort when she and Danny track down a serial killer who is murdering prostitutes in hotel rooms. Meanwhile, Erin meets a potential suitor at an art gallery who shares her interests.
Henry suffers a heart attack the day before Thanksgiving. Meanwhile, Danny investigates a young woman's suicide that may have been forced; and Frank and the mayor clash over a threat to the city.
Danny accompanies a dangerous ex-mobster who is helping him find bodies on cold cases in exchange for leniency for his son on grand theft auto. Meanwhile, Jamie works undercover in a boiler room operation, looking for a secret about the Sanfino family.
When Erin's informant is murdered, she blames herself and works to help Danny discover who killed him.
Danny and Jackie investigate a murder scene at a diner, where a witness claims a uniformed officer fled the scene after shots were fired.
On the way home with his family, Danny hits a man with his car who is fleeing from a gunman, and his family gets caught in the crossfire when Danny fires his weapon at the gunman. Frank deals with 9/11 guilt from impending loss of a friend whom he worked alongside at Ground Zero.
When a rich woman dies of a heart attack, her eccentric daughter claims that she received a message from God, who told her that her stepfather actually murdered her. Meanwhile, the archbishop wants Frank's support for the canonization of a local priest, but a reluctant Frank takes it upon himself to investigate a rumor that the priest went too far when protesting the Vietnam War.
When a man's family is robbed and beaten in front of him, and the assailant is shot and killed, the Reagan's debate about how far they would go to protect their family. Meanwhile, when a college student is arrested at a rally, Frank wrestles with her sentence due to her identity.
When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state.
A high-profile reporter and close friend to Frank is nearly assaulted while she is out with him and Danny and Jackie search for the would-be attacker. Meanwhile, Jamie's undercover case comes to a critical stage.
As Erin prosecutes a woman accused of killing her husband, the defendant's attorney is murdered and Danny is assigned to the investigation. When Danny is put on the stand to be questioned, things get heated between the brother and sister.
Danny is put in a difficult position when a gun linked to a robbery is brought in to the NYPD's gun buyback program. He must decide to either arrest the suspect or follow the "no questions asked" rule.
Danny causes waves in the department when he investigates a closed case, the suicide of a firefighter, at the insistence of the man's 12-year-old son. Meanwhile, Jamie saves a baby from a burning building but worries it will jeopardize his undercover work when he is billed a hero in the press.
Danny and Jackie are assigned to protect a key witness in a Russian mob trial, but when an attempt is made on her life, they realize there is a leak on the task force. Meanwhile, Erin is offered a job as deputy mayor, which would have her working directly with her father
Danny and Jackie investigate the suspicious murder of a high rolling investor, who had injuries from a fight, but no marks on his hands. Meanwhile, Frank puts Jaime under house arrest, when the Sanfino family put out a hit on "Jimmy Reardon".
Frank must race to stop a biological weapon attack on New York City, while keeping it a secret from his family during their most sentimental holiday, Mother's Day. Meanwhile, a long-standing conflict between Danny and Jamie comes to a head.