Danny and Jamie join forces with their nephew, Joe Hill, when Jamie and Joe's search for an undocumented teenage girl who has been sex-trafficked, converges with Danny and Baez's investigation into the murder of a woman in witness protection. Also, Frank and Erin butt heads when Frank calls out the District Attorney's office for instituting a new rule that classifies armed robbery as a misdemeanor, a mandate that has immediate ramifications for Eddie and her partner.

When Erin is stalked by a man who was recently released from prison after serving 12 years, she enlists Anthony and Danny to investigate her office's role in his sentencing. Also, Jamie works to save his badge when he is caught driving under the influence after he is unknowingly given drugs at a party, and Frank navigates multiple family issues as he deals with a troubling medical diagnosis for Henry, as well as Jamie's DUI.

Frank faces a dilemma when a Marine veteran, who became a local celebrity for saving a woman's life, asks him to make an exception to the NYPD recruitment age limit so he can join the force. Also, an encounter with an old law school rival leads Erin to look into an alleged wrongful conviction; Jamie is torn over whether to report a sergeant close to Eddie for punching a fellow officer; and Danny and Baez race to find an abducted child.

Frank is blindsided when Mayor Chase bypasses him with a request for Jamie to head his security detail. Also, Danny and Baez investigate the murder of a wealthy college student; Eddie experiences tension with her partner, Badillo, when she arrests a protestor against his wishes; and Anthony scrambles to help his half-brother when he fears money woes are leading his sibling down the wrong path.

An officer they briefly worked with at 1PP, is shot after Frank reassigned her for not meshing with their team. Also, Eddie, Danny and Baez investigate a man's murder after Eddie and her partner respond to an altercation between the victim and a neighbor, and Anthony finds himself at a crossroads when he's offered a promotion that strains his relationship with Erin.

Frank contends with public outcry to defund the NYPD School Safety Division, after a physical altercation between a school officer and a student goes viral. Also, Danny and Baez help a father track down his missing ex-wife and daughter; Erin and Anthony deal with the aftermath of the surprise release of a serial criminal; and Jamie is unsure of how to navigate inappropriate conversation among his officers in the precinct.

Erin and Anthony team up with Erin's nephew, police officer Joe Hill, to course-correct a trial when Joe becomes aware of witness tampering. Also, Baez forces Danny to help her find the killer of her favorite TV personality; a seemingly random shooting at police Lt. Raymond Moretti's home leads Frank to investigate who in the officer's family has criminal ties; and as Eddie works an SVU case, she questions her decision to become a police sergeant.

Frank contends with a potentially dirty cop within his ranks when Danny and Baez's investigation into a brutal assault on an NYPD detective reveals the officer may be corrupt. Also, Eddie and Badillo track down the culprits behind the theft of valuable rare works from a celebrated bookstore; Jamie begrudgingly joins Henry as he looks into an old friend's death he deems suspicious; and Erin snoops into the background of a new woman in Anthony's life.

Frank is at odds with his friend Archbishop Kearns when he says the NYPD arrested the wrong man for a murder, but he can't break the confessional seal to reveal the true killer's identity. Also, Danny and Baez use unorthodox methods to work around the Church's confidentiality constraints to find the real killer; Eddie defies Erin and the D.A.'s office to get justice for a sexual assault survivor; and Reagan family ties are put to the test when Jamie and his nephew, Joe Hill, butt heads over fair police practices.

Danny pursues Dickie Delaney, a con artist pretending to be the legendary singer Jimmy Buffett, after he's tricked into paying for the scammer's meal at an expensive restaurant. Also, Frank investigates NYPD Captain Terrell, who is using her badge to get free wares from local stores; Erin worries about her reputation when she's the subject of a salacious, anonymous police blog; and Jamie introduces a decades-old saluting rule in the precinct.

An illegal drug shipment arriving in New York City forces Danny to partner up with his Texas Ranger associate, Major Waylon Gates, to find the narcotics before they flood the streets. Also, Jamie makes a concerning discovery about a former mentor as he helps a neighbor handle a gambling debt, and Frank receives pushback from Mayor Chase over his handling of a brawl between demonstrators and police officers at a protest.

Frank enlists the help of an old friend, Sloane Thompson, to investigate a cyber-attack on the NYPD that forces Danny and Baez to release an evasive suspect. Also, Baez questions her place within the NYPD; Eddie is torn over a workplace dilemma; and Jamie wrestles with a family secret.

Danny partners with Anthony to solve a double homicide when Anthony's shady cousin, Joey, proves to have gang ties to the crime. Also, the boundary between Eddie and Jamie's work and personal relationship is strained when Eddie and her new partner, Badillo, ask Jamie to reassign them to different partners, and Erin questions the sacrifices she's made for her career when she allows her law school friend to dig into her personal life to prepare for a potential run for district attorney.

Danny and Baez's attempts to find the culprit who assaulted a shop owner are hindered by the close-knit community's refusal to cooperate with the investigation. Also, Erin's suspicions about her boss rise when the D.A. assigns her to a seemingly low-level case, and Gormley, Garrett and Baker are threatened when Frank welcomes a new staff member to their "dream team." 

Frank causes family tension when he assigns Jamie to guard Danny after a hit is put on him, and when Frank tries to stop his cop grandson, Joe Hill (Will Hochman), from seeking revenge after he's attacked. Also, Eddie gets a hostile new partner, and Erin's moral character is attacked by the defense when she tries an old murder case related to her boss, the D.A.

Jamie and Eddie experience marital tension when Eddie allows her newly released ex-convict father, Armin, to live with them. Also, Danny and Baez go out of their way to help a desperate out-of-town man find his missing sister; Anthony enlists Erin's help when new evidence arises in a closed case from his previous police career; and Frank goes head to head with Archbishop Kearns when a local priest calling for the NYPD to be de-funded causes friction between the force and the church.

Jamie faces backlash from fellow officers, when he partners with Erin and Anthony to investigate an underground bar the NYPD and FDNY use to hide their criminal indiscretions. Also, Eddie's partner, Witten, considers leaving the force; Danny and Baez investigate a student's murder at a prestigious private school; and Frank addresses an issue of police brutality regarding Baker's husband.

Frank must decide between remaining police commissioner and pursuing a new professional chapter when his old friend Lenny Ross presents him with an exciting job offer. Also, Sean puts Jamie and Eddie in a tough position when he tries his hand at the family business behind his father Danny's back, and Danny and Baez investigate the murder of a restaurant delivery man.

Tension escalates between Frank and Mayor Chase after Frank makes a public arrest that goes viral. Also, Danny and Baez investigate a gang attack that takes an unexpected turn; Jamie worries when Eddie lies to him about where she's going in the evenings; and Anthony secretly recruits the Reagans for help with a surprise for Erin.

As Danny consults a psychic to solve the murder of a young boy, Frank is at odds with the mayor over how best to protect the city from an uptick in crime following a high-profile shooting. Also, Erin investigates a decades-old case in which the primary eyewitness to the killing is her boss, D.A. Kimberly Crawford, who was 13 years old at the time.