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.
Frank mobilizes the entire NYPD to find the killer of an off-duty police officer who was murdered during a diamond heist.
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.
After Danny witnesses a murder by a drug lord with a history of intimidating witnesses, a member of his family is put in jeopardy in an attempt to keep him from testifying.
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.