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
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.moreless
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.
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.moreless
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 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.moreless
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.moreless
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.moreless
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.
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.
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.moreless
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
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.
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.
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.
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.
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.moreless
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.moreless
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.moreless
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.
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.moreless
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.moreless
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.moreless
Danny must figure out the common denominator when the same tragedy happens to seemingly random people. Frank helps a friend deal with his alcoholism.
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 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.moreless