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.

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 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 Danny and Baez suspect a little girl might be the victim of a kidnapping, the girl’s mother denies it, but her story doesn’t add up. Meanwhile, Frank pays a visit to a priest, a counselor to the NYPD, who was arrested on a DUI charge.

Danny and Baez investigate a homicide in which Baez’s estranged brother, a former drug addict, is the lead suspect. Meanwhile, Frank learns one of his most highly decorated officers, a German Shepherd in the K9 unit, is being accused of police brutality, and Henry investigates the widow of a former NYPD pal who might have had a hand in her husband’s death.

After a detective from Danny's precinct is killed while working undercover, Frank goes above and beyond to find the killer only to discover that the victim held a big secret; Jamie and Eddie help Nicky track down a homeless former classmate.

Jamie has become a target after intervening in an abusive relationship. Elsewhere an illegal recording of Henry making insensitive comments is leaked.

A famous basketball player is found dead of an apparent drug overdose. Danny investigates and looks into the victim’s possible ties to a local drug gang. Meanwhile, Erin revisits the case of a man she may have wrongfully convicted years ago; and Frank is approached by Archbishop Kearns regarding an eviction matter that Jamie and Eddie are working on.

Danny and Baez investigate a murder attempt against a celebrated fertility doctor with a seemingly pristine reputation. Eddie must intervene in a Reagan family matter involving Danny's boys. Erin helps Anthony find justice after a date goes wrong.

Frank questions whether a run-in with community activists was an accident or a setup. Also, Jamie strives to rely less on Frank’s input to makes decisions, Erin helps Anthony protect his daughter and ex-wife from a dangerous psychiatric patient, and Danny and his neighbor size each other up when they learn their kids are dating.

After a woman is murdered in her apartment, Danny and Baez turn to her daughter, Margo, for help, but instead she complicates the investigation. Also, someone from Jamie and Eddie’s past launches a smear campaign against them, and a mobster shows up in the DA’s office claiming to be Anthony’s long-lost brother.

DNA evidence in a murder case leads Danny and Baez to identical twins with identical alibis. Also, Frank learns Nicky is interviewing for a job at the Justice Coalition, which he rarely sees eye-to-eye with, and Jamie visits Eddie's father, Armin, in prison.

Frank's esteem for an old friend proves to be a mistake; Jamie asks Erin for help apprehending a perp who shot at him after learning she chose not to send him to prison six months ago; Eddie clashes with her new boss.

Erin disagrees with a psychiatric consultant's diagnosis of a nanny accused of abuse; Eddie confronts her boss; Frank is forced to make staffing changes he is skeptical about; a woman claims she heard someone plotting a murder.

Jamie is under investigation after his police vest is found on a perp. Frank debates whether to aid and protect an old friend whose home was invaded. Danny and Baez investigate the suspicious circumstances surrounding the death of a hotel employee believed to be a suicide. Erin asks Anthony to make a deal with a man who knows secrets about the current D.A.

After Danny witnesses a drive-by shooting, he butts head with the detective assigned to the case; a childhood friend of Jamie's is convinced that she has single-handedly solved a cold case murder.

Jamie refuses to explain why he contests the arrest report of a fellow officer who was assaulted in the field; Danny and Baez clash when their lead suspect for a murder of one of Danny's favorite comics.

Jamie and Eddie experience marital tension when Eddie allows her newly released ex-convict father to live with them; Danny and Baez go out of their way to help a desperate man find his missing sister.

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.

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.

Danny and Baez investigate after a vicious attack leaves their mutual friend, Maggie Gibson, hospitalized; Frank and the team debate the appropriate memorial protocol for a former police commissioner with a questionable professional legacy.

Frank and his grandson, Joe Hill, contend with a grievous insult to the memory of Joe's father; Erin and Henry work together to bust a scammer targeting the elderly; Eddie's captain takes suspicious interest in her efforts to locate a stolen puppy.

Eddie's former partner returns and brings an accusation of excessive force against an officer; Danny and Baez clash with a troubled foster child at the center of their latest investigation; Erin must make a tough decision about her campaign.

Jamie learns that Eddie’s close friend Tracey may be using the restaurant she owns as a drug front; Erin is accused of causing the suicide of a former colleague; Danny and Baez are faced with various descriptions of the same suspect.