Jamie feiert seine Aufnahme ins NYPD. Noch während der Feier muss Danny zum Einsatz - die kleine Teresa wurde gekidnappt. Jetzt muss alles schnell gehen, denn das Mädchen leidet an Diabetes.

Eine Gang überfällt eine New Yorker U-Bahn. Einer der Fahrgäste erschießt mit einer illegal erstandenen Waffe den Täter und beendet den Spuk. Jetzt steckt er in Schwierigkeiten.

Erin, Frank and Danny müssen gemeinsam ermitteln, als in New York einige Studentinnen überfallen werden. Ihr Hauptverdächtigter ist der Sohn eines Botschafters - doch der genießt diplomatische Immunität.

Das gesamte NYPD ist in Aufruhr, als bei einem Diamantenraub eine Polizistin

getötet wird. Von den drei Tätern fehlt jedoch bisher jede Spur.

Jemand plant einen Bombenanschlag in New York. Dies erfährt die Polizei aus einer E-Mail und startet eine Großfahndung nach dem Attentäter. Doch mit ihrem Täter-Profil sind sie auf dem falschen Weg.

Teenager probieren auf einer Party neuartige Drogen aus. Für einige von ihnen endet der Spaß tödlich. Danny kommt in Begleitung eines Spürhundes in die Uni und will der Sache auf den Grund gehen.

Erin versucht einen Gang-Anführer dingfest zu machen und will dessen Bruder zu einer Aussage bewegen. Bald gelingt es ihr, ihn zu überzeugen. Doch er stellt eine Bedingung.

Jamie beobachtet eine Straftat in Chinatown. Als er einen der Täter verfolgt, wird dieser von einem Auto erwischt. Das Dezernat für interne Ermittlungen leitet ein Verfahren gegen Jamie ein.

Als drei Kriminelle aus dem Gefängnis entlassen werden, ist das Leben von Erin in Gefahr. Schließlich war sie es, die dafür gesorgt hat, dass die drei in den Knast kamen. Nun wollen sie Rache üben.

Danny ermittelt im New Yorker Nachtleben, als vor einem angesagten Club ein Türsteher getötet wird. Währenddessen wird Frank mit einem schwerwiegenden Geheimnis seines Ex-Kollegen konfrontiert.

Danny und Jacky ermitteln im Fall eines ermordeten Escort-Girls. Frank beschäftigt sich mit einem Fall aus der Vergangenheit, als die Überreste eines vor vielen Jahren ermordeten Jungen auftauchen.

Danny lernt die Abgründe einer Parallelgesellschaft kennen, als der Sohn eines russischen Gangsters ermordet wird. Währenddessen schlägt sich Erin mit einem großen Korruptionsfall rum.

Ein Undercover-Ermittler, der sich in eine Terror-Zelle geschleust hatte, wird getötet. Das Team muss herausfinden, wie es zu der Tat gekommen ist und weitere Anschläge verhindern.

Ein junges Mädchen wird entführt und gefangen gehalten. Die Ermittler nehmen ihren drogenabhängigen Freund ins Visier. Für Erin und ihren Boss wird es unerwartet romantisch.

Jemand schießt auf offener Straße auf Frank. Danny macht sich auf die Suche nach dem Täter. Er will herausfinden, ob Frank ein zufällig gewähltes Opfer ist, oder ob es sich um einen Racheakt handelt.

In der Nähe eines Debütantinnenballs wird die Leiche eines unbekannten Mädchens gefunden. Danny und Jackie suchen eine Prostituierte, die auf den Aufnahmen der Überwachungskamera auftaucht.

Ein obdachloser, hochdekorierter Marine wird zu Tode geprügelt. Danny, der selbst Ex-Marine ist, setzt der Fall mächtig zu. Um die Schuldigen zur Rechenschaft zu ziehen, riskiert er sogar seinen Job.

Danny ist Augenzeuge einer Schießerei auf offener Straße. Seine Ermittlungen führen ihn auf die Spur eines peruanischen Drogen-Boss. Als Danny aussagen will, ist seine Frau in Gefahr.

Erin ist mit Nicky und Linda bei einer Modenschau. Als Lindas Tochter und ein anderes Model zusammenbrechen, kommt der Verdacht auf, dass jemand die Mädchen vergiftet hat.

Ein Tourist aus Iowa wird vor einem angesagten Lokal ausgeraubt und erschossen. Frank muss nicht nur den Täter finden, sondern sich auch noch mit der sensationshungrigen Presse auseinandersetzen.

Ein Paar aus der Nachbarschaft der Reagans wird ermordet. Jemand stiehlt Jamies

Dienstwaffe. Er vermutet, dass die "Blauen Templer" etwas damit zu tun haben.

Jamie teilt mit der Familie seine Vermutungen zum Todesfall von Joe und erzählt von den "Blauen Templern". Frank ermittelt auf eigene Faust und stößt dabei auf die Anführer des geheimen Klans.

Frank is put on the spot when a supporter for the mayor is found dead and the mayor wants Frank to position it as a random act of violence to the public. Meanwhile, Jamie goes on his first undercover assignment at a bar where meets and bonds with a suspicious patron.

When Danny is put on modified assignment after an incident in which a cop--who failed to identify himself--is shot, he faces Internal Affairs investigators, who are looking to his state of mind on that day for further implications.

Three men attempt to rob a bank and Danny discovers that one of attempted robbers is a former cop. Also, Jamie works with Luisa Sosa, his new partner.

Erin has to re-open a 18yr old rape case in which Frank was the arresting officer. Danny and Jackie have to deal with the murder of three teenagers for which there appears to be no motive.

Even while on a case, Danny tries to swing a romantic weekend with Linda. Jamie's undercover assignment involves 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'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 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.

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.

When Frank’s close friend, a high-profile reporter, is almost assaulted while in town investigating a story, Danny and Jackie attempt to track down her would-be attacker. Meanwhile, Jamie’s undercover case comes to a head.

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 Jamie 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.

A dangerous criminal from Danny's past comes back to seek revenge and kidnaps Jackie. Meanwhile, Jamie meets his new partner, while a young officer is shaken after he accidentally shoots an innocent man.

A woman recants a domestic-abuse claim, but Danny and Jackie continue to investigate the situation. Soon they uncover the woman's secret affair with a powerful politician who's friends with Frank. Meanwhile, Linda returns to the workforce, causing chaos at home.

Danny believes a serial killer is on the loose when two separate murder victims are identified as members of a group charged with a gang rape. Meanwhile, Erin’s ex-husband, attorney Jack Boyle, resurfaces in her life as they face off in court.

Danny and Jackie set out to investigate the murder of a bride on her wedding day in a drive-by gang shooting. However, they are pulled off the case and assigned to the protection detail of a Central American president, who they believe is a target for assassination. Meanwhile, Jamie questions his partner Vinny’s methods when he performs an unjustified stop.

Shortly after Frank awards a detective with the Medal of Valor for his undercover work for the NYPD in Malaysia, the detective is taken hostage by a Malaysian drug lord whose brother he helped put in prison. Meanwhile, Henry goes on a ride-along with Jamie and has a different method of getting the job done.

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. Meanwhile, Jamie and Vinny bust a drug operation.

When a knife-wielding attacker dressed as Baron Samedi, the Spirit of Death, stabs a man in costume on Halloween, Danny enters the world of voodoo. Meanwhile, DCPI Garrett opens up to Frank about a dark secret, and Erin and Nicky take Jack and Sean trick-or-treating.

Danny arrives at a college campus to find a murdered student, who was thought to be dealing drugs. Meanwhile, Jamie has a life crisis when he reconnects with a former law school classmate and Erin must learn to give Nicky some freedom.

When Danny and Kate come up empty-handed with leads for a shooting, Linda helps make a break in the case when she overhears the victim telling his priest who is responsible. Meanwhile, Henry is mugged at an ATM, which sends Jamie into a rage as he tries to track down the assailant.

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. Meanwhile, a bicycle accident sends Danny’s son Sean to the hospital with a life-threatening injury.

Jamie must deal with the emotional consequences of his actions on the job. Meanwhile, Erin questions Mayor Poole on the witness stand.

Danny’s car matches an NYPD description of a car involved in a drug deal and taken into custody when a bag of cocaine is found in his trunk.

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. Meanwhile, Frank must be diplomatic when dealing with a bigoted radio host who will be broadcasting from New York City.

Before a Hasidic Grand Rebbe passes away, he chooses his youngest son to succeed him. But when the new appointee dies suddenly, Danny investigates the oldest son and others within the Hasidic community. Meanwhile, Henry reveals a family secret to Frank.

When a 10-year-old boy is the victim of an incident in the projects, Danny’s heated approach to the case lands him in anger management class. Meanwhile, Frank navigates the politics of the State Department and the Turkish Government in order to help a young Turkish woman avoid persecution.

Erin and Danny investigate a cold case of a girl who was attacked by her rich and powerful boyfriend, who was never convicted. Meanwhile, Jamie’s friend brings a lawsuit against Danny’s friend after an injury at a pick-up basketball game.

When an off-duty cop tries to stop a bank robbery, he is disarmed by the "Bonnie and Clyde" robbers who take his gun and wound an innocent bystander. Meanwhile, Frank considers getting romantically involved with a woman from the ACLU who happens to be Erin's acquaintance.

When the same tragedy occurs to people who don’t appear connected, Danny must find what they have in common and who is responsible. Meanwhile, Frank helps an old friend come to terms with his alcoholism.

When a devoutly religious young woman is found murdered in a cemetery, Danny questions her family who is shocked to learn that she had a secret relationship.

When two Wall Street brokers are killed in drug deals, Danny looks to question a wounded accomplice at the hospital but he is stopped by Linda, who won’t let Danny see him until after surgery. But when the accomplice dies during the procedure, Danny and Linda battle over the judgment call.

When Danny finds a disoriented man in a park covered in his girlfriend’s blood, he finds it hard to believe that the man has no recollection of the night’s events until they find a strong narcotic in his bloodstream. Meanwhile, Jamie gets into trouble when he helps an off-duty officer cover up his intoxication after he apprehended an armed robber.

Danny blames himself when a young woman commits suicide because he had made a promise to her in the wake of her parents' deaths. Meanwhile, violence involving a gang at a housing project erupts and affects the Reagans.

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. Meanwhile, Frank is left reeling from a second loss.

Danny und Baez schließen sich mit Dannys altem Partner zusammen, um einen Nachahmermörder zu finden, der die Morde eines Kriminellen aus einem früheren Fall nachahmt. Frank und Bürgermeister Chase streiten darüber, wie sie am besten mit der wachsenden Obdachlosenbevölkerung der Stadt umgehen können.