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

When a doorman at a New York City hot spot 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.

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 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.

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 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 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.

An escort is murdered in a hotel room. Sensing a pattern, Jackie poses as a decoy escort. Frank has budget constraints but resisting unions. Henry declines a consultant's role in a private agency looking to profit from outsourcing in NYPD.

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.

Nicky gets a reality check when her absent father shrugs her off. An illegal immigrant is robbed of his cash. His son accidentally kills the robber. Danny coaches the son in making a statement which would get him a lower sentence.

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.

In the course of a murder case trial, another murder takes place and Danny, the detective, finds himself pitted against Erin, his prosecutor-sister, in the courtroom. Frank's onyx credit card is misused after fraudulent duplication.

A man dies in the reception area of a hospital. The investigation leads to an illegal fight club with heavy betting. The fight was doctored by cementing the gloves of one fighter. Jamie's cover is blown, and he saves Noble from a mob hit.

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.

When Erin's key witness, an infamous photographer, is nearly killed in a hit and run, she arranges for Danny to work protection detail to safeguard him.

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.

When two motorists driving gas-guzzling cars die at the hands of a sniper, Danny and Kate are put on the case of what the city believes is the work of a radical environmental serial killer.

Danny is pulled over by a cop who asks if he can look what he has in the back of his vehicle. Danny asks him what's going on, he says he got a tip that a vehicle like the one Danny is using, was at a drug buy. Danny thinking it's outrageous and lets him look but the cop finds some drugs and arrests Danny. When the family learns of this, Linda wants Frank to intervene and he doesn't think he should and he says that's for everyone. Henry asks Erin's ex to defend Danny and he does by making him question his trust of his partner. And when he sees her with the IAB Captain investigating him, he wonders if he can trust her.

When a man with multiple rat bites is thrown from a moving car, Danny works the case to find out why and who was trying to send a message. Mary Elizabeth Mastrantonio and Mark Moses guest star.

The former mayor gingerly approaches Frank after Jamie arrested his spoiled-rotten brat daughter, by the book, for drug possession and gross disrespect, which continues even in court. While Henry attends the funeral of his Hassidic friend, the New York grand rabbi, his junior son and designated successor is fatally stabbed just outdoors. Thus the firstborn, traditional successor becomes grand rabbi and prime suspect, or his bodyguard. Investigating, Danny and ex-Hassidic fellow detective Wolf Landsman find further possible motives in the rabbinical family's secret love life and consider further strong-armed acolytes opportunities.

Danny and Jamie are playing basketball with some other guys. A guy Danny knows gets into it with a guy Jamie knows; the guy Danhy knows smacks the guy Jamie knows. The one who was smacked has to be hospitalized and he demands that the one who smacked him be arrested and Danny reluctantly does it. He tells the guy he knows that his sister is the D.A. and maybe he can talk to her. Erin is approached by a man who asks her to re investigate his daughter's unsolved murder which is 15 years old. Erin goes to Danny and asks him to look into the man's daughter's murder. It seems the man thinks that his daughter's boyfriend who's the son of a wealthy man should be considered. Danny agrees, if she helps his friend. Danny goes to see the detective who investigated the murder and he tells Danny that he had an alibi and took a polygraph and passed. Erin informs Danny that his friend has a previous record which means he has to be indicted. Jamie offers to talk to the guy he knows. Erin and Danny see the man and tell them what they learned. He tells them that the guy's father's company has polygraph which he could have learned how to beat it. And he also tells them that his alibi witness was a friend. So Danny decides to look deeper. Frank and Garrett have a disagreement when Frank is interviewed and a very touchy question is asked.

Amid protests over the NYPD's new "stop, question and search" policy, Erin and the entire Reagan family are targeted by a protest group's photographer, who is publishing the photos to a website. When a rape victim that Erin is preparing for trial appears in some of the photos, Erin confronts the photographer. Danny and Detective Maria Baez investigate a young "Bonnie and Clyde" type couple who rob a bank and steal an off-duty police officer's gun in the process, but the intrusion of the FBI threatens their progress. Elsewhere, Frank considers getting romantically involved with an ACLU representative named Whitney, who is an acquaintance of Erin's and close to Erin's age.

When a man is shot in Times Square, Danny investigates and learns the man had no enemies or reason for someone to kill him. Another person is killed and there appears to be no connection between the two victims. He later learns that the second victim got away with murder so he thinks someone is trying to get payback. Erin takes him to the D.A. who prosecuted the second victim. The man's irate about the victim because he feels she should have been convicted. When a third person is killed, Erin figures out what the link is. Jamie finds a boy wandering the streets with blood on his clothes. He takes him back to his parents and can't help but wonder if there's anything wrong at their home. An astronaut who just retired, who's also a friend of Frank, comes to the New York. They meet and the man drinks very heavily and talks about his family, but Frank learns the things he said about his family are not true and tries to help him.

Danny was about to apprehend a known drug dealer but a man who accompanied him starts shooting and even the dealer is hit. Danny goes to the hospital to talk to him but Linda won't let him. Later the shooter kills someone else. And when the dealer dies, Danny is upset with Linda. Danny asks Jamie to help his son with a soap box derby that the family has won since Frank joined. And a rival family tells them, they're going to get them. And Henry reveals to Frank why they've been winning. And Erin is promoted. On her first day, one of the prosecutors, tells her she prosecuting a case and the defendant is facing his third strike. So she looked at his previous convictions and learns that one of them might be questionable and Erin looks into it and the one who prosecuted it was the person who promoted her.

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 an armed robbery ends with the death of a police officer, Frank makes it a mission for the NYPD to bring the suspect to justice.

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.

Following Frank's dinner with mob lawyer Angelo Gallo, Gallo is shot, and Frank narrowly escapes with his own life. Meanwhile, Danny is called for jury duty, and winds up being the sole dissenting opinion in a murder trial.

Danny and Baez investigate a homicide in which Baez's estranged brother, a former drug addict, is the lead suspect. Meanwhile, Frank learns one of his most highly decorated officers, a German Shepherd in the K9 unit, is being accused of police brutality, and Henry investigates the widow of a former NYPD pal who might have had a hand in her husband's death.

Danny and Maria investigate a local bombing, but are met with tension and resistance from the community during the investigation. Meanwhile, Frank must deal with the political fallout when a man punches an officer who was overly aggressive in his questioning.

Danny's loyalty is tested when he is assigned to the case of a childhood friend, Mickey, who is under investigation for having ties to an infamous mob family. Meanwhile, Frank gets word that crime is on the rise due to a recent judicial ruling about the legality of the "stop and frisk" policy.

When Danny learns from Nicky that there's a deadly new brand of heroin hitting the streets, he begins an all-out manhunt for the distributor. Meanwhile, Frank pulls out all the stops to assist in getting the drugs off the street.

Danny and Maria must track down an Army veteran who Danny thinks is suffering from PTSD. Meanwhile, Frank is caught off-guard during a press conference by a woman who is seeking justice for her murdered daughter.

Jamie get a fake phone number from a sexy bicycle messenger who he later discovers is using counterfeit $50s. A woman named Jill calls Danny threatening to end her life. Frank chaperones Sean's school field trip to a museum.

Danny and Maria investigate when an expectant mother is a victim of a "knockout game," in which teenagers punch unsuspecting civilians in the head. Meanwhile, Frank wrestles with promoting an officer when he thinks it can be viewed as favoritism.

Danny and Maria investigate the murder of a respected college professor who was involved with a questionable scholarship program. Meanwhile, Danny discovers that his father didn't tell him that the District Attorney is investigating Danny for ethical and procedural violations.

Danny gets himself into trouble after being told not to pursue a suicide case of a C.I. of the D.A. Jamie and Janko get involved in an immigration case of couple wanting to get married, but the bride's father is against them.

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.

Danny Reagan is accused of police brutality. Frank has to walk a fine line in the investigation and find the truth. Jamie meets a female doctor, and it makes Janko uneasy.

A woman's abusive boyfriend targets Jamie after he intercedes in a domestic dispute. Elsewhere, the press get ahold of an illegal tape capturing Henry's insensitive comments, and Frank must deal with the ensuing scandal.

Frank faces public backlash after an officer's body camera malfunctions during an altercation with a civilian.

Three community leaders are killed in apparent hate crimes, and Danny and Baez investigate as Frank meets with folks who want to ensure the gravity of these crimes is not ignored. Meanwhile, Linda wants to protect herself with a gun after getting mugged.

Jamie gets Danny involved when he finds a homeless teen who claims his aunt was killed by her boyfriend. Meanwhile, Erin is angered when McCoy replaces her as the prosecutor on a case involving a corrections officer.

Danny and Baez look into the murder of a lower income resident living in a luxury building where a percentage of units are available for lower income housing. Frank disagrees with a detective friend of Gormleys.

Baez is held hostage in an interrogation room by a distressed man who wants to see his daughter. Elsewhere, Garrett's son gets in trouble with the law, so Garrett turns to Frank for help, creating an ethical dilemma for the police commissioner.

Eddie goes undercover for the first time when she tries to take down a kidnapping ring, which is luring in young women with websites for phony youth hostels. Elsewhere, Frank assists a woman who wants to confront the inmate who murdered her family.

An investigative journalist refuses to give up a source who admitted to committing murder.

When NYPD Deputy Chief Donald Kent and his wife are gunned down in an apparent gang hit, Frank orders the whole department to scour the city for his friend's killer.

In the conclusion of the two-part Season 5 finale, one of the Reagans is shot by a gang member, and Danny pursues a suspect while trying to keep his emotions in check. To add to the complications, Danny has to find an inventive way to bring in witnesses.

When a newspaper reporter is targeted while wearing NYPD gear during a ride-along, Frank thinks the shooter is targeting cops.

Danny joins the search for two escaped convicts after learning that one is someone he helped wrongfully imprison.

Linda is concerned when an elusive serial killer starts threatening her, Danny and their kids; during a hostage situation, Jamie challenges a superior officer.

Danny is interrogated by the District Attorney's investigator when his ex-partner is accused of planting evidence in order to wrap up a homicide case. Also, when radical anti-government activists threaten to publicly burn an American flag, Frank grapples with the limits of free speech.

Frank deals with the aftermath of a retired cop who shot his mugger. A trainer flouts authority, mingling with Janko. A man Baez saw kill her friend 25 yrs. ago has returned; she and Danny figure out how to bring him to justice.

Four gorgeous women used in a local brothel admit to murdering their evil boss. Danny and Baez must figure out the real killer. Frank and his priest argue over mercy in the Catholic Church while Nicky Reagan-Boyle gets in drug trouble with her friends but no one takes the blame.

The newest Speaker of NY City Council, (Whoopi Goldberg), a chronic malcontent, wants to dismantle the NYPD's "Broken Windows Policy," a position Frank vehemently opposes. Erin worries when the wife of her good friend and mentor, Judge Wilson, dies as a result of DUI, and, his sentencing suddenly runs off the rails. Linda's co-worker at the hospital has a problem with her ex-husband. Linda asks Baez and Danny to talk to the parties involved and it turns into a big ordeal. Judge Wilson takes on attorneys who dare to argue with the bench (i.e. our jobs); it may be time for a Judicial Ethics Commission Complaint. Does Erin have the balls to file one?

An officer involved in the controversial shooting of an unarmed person 14 years prior, is up for a promotion which brings up mixed feelings from various NYPD officers, in addition to forcing Frank Reagan to make a difficult decision.

As Frank contends with a whistleblower within the NYPD who claims to have evidence of abuse of power in the organization, Danny and Baez investigate the case of a woman who was struck by a car under suspicious circumstances.

When the son of Frank's most outspoken critic is murdered, Frank and the boy's father must put aside their differences to seek justice.

When Eddie and Jamie become overly involved in a complicated adoption case between the birth and adoptive parents, they ask Erin to help them settle the dispute without going to court. Also, Frank looks into reports of NYPD cadets cheating on their psychological exams, and Danny learns that Jack plans to enlist in the Marines after graduation.

An ex-NYPD officer goes missing after telling Danny of her plans to make amends to the woman she and her partner wrongfully convicted.

Danny contemplates retiring until Erin enlists him to help her with a case involving her ex-husband.

Erin's trial against a human trafficker is jeopardized when the presiding judge is found dead.

A detective in a mob case is killed. Garrett is accosted outside his home by a SWAT team after a false report. Erin is approached by an acquaintance of Anthony who offers to help in an organized crime case over Anthony's objections.

Cases of the week include (Frank) prison riots due to a social experiment the mayor is trying, (Jamie) an 18 year old that overdoses, and (Danny) a wife and mother found murdered in her home.

When a famous basketball player is found dead in his apartment of an apparent drug overdose, Danny looks into ties to old friends in a local gang. Erin is forced to re-examine the case of a man she convicted years ago who may be innocent.

Cases this week involve (Danny) a widowed nurse that is the victim of domestic violence, (Frank) a woman that alleges corruption at the jail, and (Jamie/Janko) an illegal alien that gives birth and lives in a condemned home.

Eddie's judgment is clouded by her past when she arrests a loathed college acquaintance; Frank is hesitant to mar the spotless record of a member of the force who tested positive for marijuana.

Jamie and Eddie ask Erin to drop the charges against a man who bravely rescued a woman from a local hostage situation; Danny and Baez work a case involving car thieves and discover the leader is a mobster they've dealt with before.

When Henry is the key witness on Danny and Baez's case, his meddling eventually leads them to valuable information. Nicky shocks the family by siding with an activist friend of hers. Jamie and Eddie learn a parole officer is taking advantage of his power.