Frank causes family tension when he assigns Jamie to guard Danny after a hit is put on him; Frank tries to stop his grandson from seeking revenge after he’s attacked; Eddie gets a hostile new partner.

Danny partners with Anthony to solve a double homicide when Anthony's shady cousin proves to have gang ties to the crime; the boundary between Eddie and Jamie's work and personal relationship becomes strained.

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 pursues a con artist pretending to be the legendary singer Jimmy Buffett; Frank investigates an impressive police captain who is using her badge to get free wares from local stores.

Frank is at odds with his friend Archbishop Kearns when he says the NYPD arrested the wrong man for a murder; Eddie tries to get justice for a sexual assault survivor; Jamie and his nephew, Joe Hill, butt heads over fair police practices.

Frank contends with a potentially dirty cop within his ranks; Eddie and Badillo track down the culprits behind the theft of valuable, rare works from a celebrated bookstore; Erin snoops into the background of a new woman in Anthony's life.

Frank is blindsided when Mayor Chase bypasses him with a request for Jamie to head his security detail; Danny and Baez investigate the murder of a wealthy college student; Anthony fears money woes are leading his sibling down the wrong path.

Erin is stalked by a man who was recently released from prison; Jamie works to save his badge when he is caught driving under the influence after he is unknowingly given drugs at a party; Frank navigates multiple family issues.

Jamie and Joe search for an undocumented teenage girl who has been sex-trafficked; a woman in witness protection is murdered; Frank calls out the district attorney's office for instituting a new rule that classifies armed robbery as a misdemeanor.

Eddie and Jamie deal with a domestic violence case associated with an investigation lead by Danny and Baez; Frank and his friend go on a mission to avail themselves to an unfiltered look at the city; Erin is presented with a surprising offer.