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Danny's upset he couldn't help a young woman who commits suicide. The Reagan family looses someone close due to the gangs in the projects.
The Reagans unite behind Danny when he's arrested after a stop of his vehicle reveals a bag of cocaine in the trunk.
Frank narrowly escapes death when mob lawyer Angelo Gallo is shot following their dinner meeting. Danny's stint as a juror in a murder trial causes friction when he's the only dissenting vote.
After losing someone close, the Reagans join forces to bring down the gang leader responsible. Danny focuses in on the gang leaders' girlfriend as a way to find him. Frank is hit hard by a second loss.
Danny discovers a disoriented man in the park covered in his girlfriend's blood with no memory of what happened. After a strong narcotic is found in the man's blood, Danny must figure out what transpired. Jamie's good deed helping out a intoxicated off-duty officer gets him in trouble.
Danny must figure out the common denominator when the same tragedy happens to seemingly random people. Frank helps a friend deal with his alcoholism.
Linda helps out Danny and Kate when she overhears important information related to their shooting case. Jamie is determined to track down the person who attacked Henry at an ATM.
Danny helps out Erin by playing bodyguard to her key witness after he's almost killed in a hit and run. Jamie and Vinny bust a drug operation.
Danny and Jackie's investigation into a drive-by murder is reassigned when they are needed to protect a central American president who's been targeted for assassination. Jamie begins to question his new partner's methods.
To obtain leniency for his son, an ex-mobster helps Danny on some cold cases. Jamie is working undercover to find a secret about the Sanfino family.
A dangerous criminal that Danny put away seeks his revenge by kidnapping Jackie. Jamie gets a new partner. A young officer accidentally shoots an innocent man.
When two separate murder victims are found to be part of a group charged with gang rape, Danny considers the possibility that the same person killed them both. Erin faces off in court against her ex-husband Jack Boyle.
Danny and Baez' latest investigation involves a woman whose body was dumped after plastic surgery. The M.E. finds the cause of death to be a lethal dose of fentanyl. Frank asks Jamie to examine a cold case. Erin decides to try speed dating but ends up going against someone in court that she met at the event.moreless
Danny's on the hunt when a Malaysian drug lord takes a recently decorated NYPD detective as his hostage. When Henry goes on a ride-along, Jamie is introduced to other ideas about how to do his job.
The murder of an esteemed college professor caught up in a dubious scholarship program is investigated by Danny and Baez. Danny finds out he's being investigated by the District Attorney for ethical and procedural violations.
Danny and Jackie investigate when a uniformed officer is seen fleeing the scene of a murder at a diner.
Danny and Jackie discover a leak in the NYPD after an attempt is made on their witness in protective custody. Erin has a chance to work with Frank when she's offered the job as deputy mayor.
While out in the car with his family, Danny becomes involved in a shooting when a man running from a gunman crosses the path of the car. Frank says goodbye to an old partner and friend.
For the season four finale, Danny's investigation into an off-limits case gets him placed on modified duty. He then realizes he's uncovered information that someone wants to keep hidden which he passes on to Frank. Frank becomes concerned with the sheer size of the case and how far it reaches internally.moreless
A little girl seems to have been kidnapped, but her parents say otherwise. Frank goes to see the counselor for the NYPD after the man is arrested for a DUI.
After family is robbed and beaten and the assailant is shot and killed, the Reagans discuss how far they'd go to protect their family. Frank is conflicted with charges brought against a girl arrested at a rally when her identity is revealed.
Mayor Poole scrutinizes Frank's department when accusations of excessive force are levied on an officer. A Wall Street securities trader with a gambling addition is murdered.
A drug deal gone bad results in two deaths and a wounded accomplice. When Danny gets to the hospital Linda won't allow him to question the suspect until after surgery. A battle ensues between Danny and Linda when the suspect dies in surgery.
When a woman calls in threatening to kill the man who killed her parents, along with herself, Danny must race against time to find her. Frank goes along with Sean on a class field trip and does his best to get the chaperone to let the kids have some fun.
A stabbing death has Danny investigating a voodoo community. Garrett discusses a dark secret with Frank. Jack and Sean head out with Erin and Nicky for some trick or treating.
Danny and Erin collaborate on a cold case involving a girl who was attacked by her boyfriend who was never convicted. A friend of Jamie's sues Danny's friend after an injury at a pick-up basketball game.
A high-profile reporter, who happens to be a close friend of Frank's, is in town and almost assaulted. Jamie's undercover case reaches a critical stage.
Danny investigates the murder of a college student who may have been dealing drugs. Jamie reconnects with a former law school classmate and wonders if he made the right career choice. Nicky's growing up and Erin has to learn to give her some freedom.
When a drug case informant holds Erin at gunpoint inside the courtroom, Danny turns into a negotiator. Jamie's punishment for disobeying orders is Frank's responsibility.
When a 12-year-old boy insists Danny reinvestigate the suicide of his firefighter father, his gut tells him to listen. Jamie's heroic actions at a building fire have him concerned his undercover work could be put at risk.
While Erin is prosecuting a murder case, the defendant's attorney is murdered. Danny is assigned to investigate but things get tense when Erin questions Danny on the stand.
Danny and Jackie investigate when an injured woman recants after making a domestic violence claim against a councilman, who also happens to be a friend of Frank's. Danny has to adjust when Linda goes back to work.
Danny and Erin must work together to find out who killed her informant.
Danny and Kate investigate what might be an environmentalist killing motorists in their gas-guzzling cars. Sean's life hangs in the balance after a bicycle accident.
A cop is accused of killing a suspect already in custody, and Erin gets assigned the case. Elsewhere, Jamie tries to convince Eddie to reconcile with her dad.
After an on the job incident, Jamie meets with a NYPD psychologist to deal with his emotional aftermath. Meanwhile, Erin questions Mayor Poole on the witness stand during a trial with a very no-nonsense judge presiding.
A political crisis ensues following a 911 call at a religious center. Jamie and Renzulli are injured when they attempt to enter the center to respond to the call.
Danny investigates when a man with multiple rat bites is thrown from a moving car. Curtis Swint, a bigoted radio host, broadcasting from New York City proves trying for Frank.
The current case of a kidnapped girl brings back memories of a similar unsolved case that Danny worked on years ago. Frank and Kelly Peterson are at odds about disclosure of information on a program that lets Frank direct intelligence officers overseas.
Danny and Baez search for a Marine veteran with PTSD. A woman seeking justice for her daughter who was murdered approaches Frank at a press conference.
A Hasidic community is under investigation by Danny when the successor named as Hasidic Grand Rebbe is murdered. Henry reveals a family secret to Frank.
Frank made an arrest in a rape case 18 years ago and Erin decides to reopen the case. Danny and Jackie have to deal with the murder of three teenagers for which there appears to be no motive.
Danny and Baez look for the killer of a popular drag queen found murdered in a local park. After she's kidnapped by an accused drug dealer's mother, Erin reexamines the case.
The death of a free spending and extravagant investor looks suspicious to Danny and Jackie. Jamie is placed under house arrest when a hit is placed for "Jimmy Riordan".
Frank and Danny go after the distributor of a deadly new brand of heroin.
Danny's latest case involves a pair of "Bonnie and Clyde" bank robbers. Frank contemplates dating a woman who's a friend of Erin.
Danny discovers that a former cop is one of the men who attempted to rob a bank. Jamie gets a new partner.
Unbeknownst to his family, Frank must deal with a potential biological weapon's attack on New York City as they celebrate Mother's Day. Danny and Jamie's long standing dispute comes to a head.
An undercover cop in Danny's squad gets killed, and Frank is determined to find the murderer. However, things get complicated when the victim's secret is unearthed. Elsewhere, Nicky turns to Jamie as she looks for an ex-classmate living on the streets.
Danny must investigate his childhood friend, Mickey, who's come under investigation for having ties to a well-known mob family. The results of a recent judicial ruling regarding the legal status of "stop and frisk" indicate a rise in crime.
Internal Affairs starts an investigation after Danny accidentally shoots a cop. The big question they look into is his personal state of mind at the time of the shooting.
Erin releases a murder suspect due to lack of evidence and finds herself at odds with the rest of the Reagan household. Frank makes it his mission to find justice, since the armed robbery lead to the death of an NYPD officer.
A gun buyback program has a "no questions asked" rule but when a gun returned is linked to a robbery, Danny must decide whether to follow the rule or arrest the suspect.
Danny and Jackie investigate the murder of a Reagan family friend who was an undercover detective. Danny's family starts to worry as the persistent search takes an emotional toll on him.
Danny and Baez's homicide investigation establishes her estranged brother, Jave "Tic-Tac" Baez, as the main suspect. Frank investigates police brutality complaints against a German Shepherd in the K9 unit. Henry checks out the widow of a former police pal when he suspects she might have had some responsibility for his death.moreless
When a killer starts targeting prostitutes, Jackie goes undercover as an escort. Erin meets a guy whose interests coincide with hers.
When one of the Mayor elect's supporters, who's also the husband of Erin's close friend, is found dead in his car, the Mayor pressures Frank to play it as a random act of violence. Meanwhile, Jamie goes on his first undercover assignment.
Danny's assigned to take an anger management class after his handling of a case involving a 10-year old victim. Politics are the order of the day as Frank tries to help a young Turkish woman avoid persecution.
Even while on a case, Danny tries to swing a romantic weekend with Linda. Jamie's undercover assignment involves a crime family.
Danny and Baez get resistance from the community while investigating a local bombing. After a man punches out an officer during questioning, Frank is left with the political fallout.
Danny and Baez investigate when the latest victim of a "knockout game" is an expectant mother. Frank struggles with a decision to promote an officer after he determines it might look like he's giving the officer preferential treatment.
Danny and Maria's latest case involves a homeless man who may have pushed a teenager in front of a subway car. The new Inspector General with oversight over NYPD policy meets with Frank.
Celebrity movie star Russell Berke shadows Danny at work as research for his next role. When he's stabbed, Danny has to keep things quiet lest the media find out.
Henry's heart attack on Thanksgiving eve leaves the family contemplating a future without him. While Danny and Jackie look into a suicide that may not be what it seems, Frank and the mayor disagree about a threat to the city.
Danny investigation into the murder of a religious young woman reveals a secret that shocks her family. Frank and the 12th Precinct must contend with a disgruntled ex-police officer who is targeting those he holds responsible for his current situation.
Jamie must answer for his actions in the death of a gangbanger. Baez goes undercover to find out if Danny's ex-girlfriend's fiancée is dealing drugs.
After a wealthy woman dies of a heart attack, Danny and Jackie must investigate when her daughter claims God told her that her stepfather actually murdered her mother. When the archbishop comes asking for Frank's support for the canonization of a local priest, Frank decides to check into a rumor about the priest back when he protested the Vietnam War.moreless