While searching for the kidnapped daughter of a district attorney, the team realizes that the person responsible is now after her identical twin sister.
The Reagans are shaken when the newest member of the family is learned to be an undercover agent working for the ATF to dismantle a gunrunning operation.
Danny turns to a psychic to help solve a young boy's murder; Frank and the mayor have opposing views on how the city can be protected during a rise in crime.
Jamie's fellow officers scorn his decision to investigate an underground bar used by the police and fire departments; Eddie's partner contemplates quitting.
Jamie and Eddie's relationship is strained when Eddie decides to let her father live with them; Danny and Baez go through extra effort to find a missing woman.
Danny and Baez attempt to convince a community to cooperate with their investigation into a shop owner who was assaulted; Erin's suspicions about her boss grow.
Anthony's cousin complicates a murder investigation with gang ties; a partner reassignment strains relationships; Erin's old friend digs up past demons.
After a cyber-attack against the NYPD results in Danny and Baez releasing a slippery suspect, Frank goes to an old friend for help with the investigation.
Danny teams up with an associate from the Texas Rangers to find a drug shipment; Jamie helps a neighbor with a gambling debt and makes a concerning discovery.
The archbishop tells Frank that the NYPD arrested the wrong man for murder, which he learned in confession; Eddie works for justice against sexual assault.
Frank deals with the idea that someone under his leadership might be corrupt after Danny and Baez's investigation into the violent assault of an NYPD detective.
A school officer and a student have a physical altercation so Frank must deal with an outraged public's efforts to defund the NYPD School Safety Division.
A detective is shot after being reassigned; a man is murdered after an altercation with a neighbor; Anthony is pulled in different directions with a promotion.