The team realize they have a cross-country serial killer on their hands the case has ties to Isobel's father, Robert, and his hotel, leading to revelations about their fractured relationship.
After Rina is critically wounded while heading to work with Jubal the team makes the chilling discovery that a vengeful Vargas orchestrated the shooting from behind bars and continues to target the rest of their team and their loved ones.
A widow is shocked that her new "boyfriend" is the manipulative leader of a terrorist group planning an attack Scola is reminded of his brother's death on 9/11 Tiffany worries about his emotional choices during the investigation.
After a young girl is kidnapped from her daycare, the team must help her parents navigate a debt owed to the deadly gang in their neighborhood Maggie struggles to focus on the case when her sister returns from rehab.
The team must track down a shooter targeting detectives from the same precinct and unit while facing mounting tension from the NYPD Tiffany finds that her NYPD roots may be influencing her view of the situation.
After a suburban woman is kidnapped from her home, the team looks into trysts on both sides of a seemingly perfect marriage OA feels pressure from Mona to make changes in his career path.
The team hunts for a serial killer who is targeting young, homeless men Tiffany and Scola don't see eye to eye on how to handle the case.
The team finds a connection between bombings and a private veterans' club in New York City Isobel tells a reluctant OA to recruit a former Army buddy for intel.
A young oil-rig operator (George Maharis) hires Sonny and Will for huge salaries.
Alimony payments drain the resources of a rodeo operator.
A shortcut lands Sonny and Will in the clutches of escaped convicts.
A witness in a former case of Erin's asks her to help shut down a drug operation while investigating a teen's suicide, Danny and Baez find clues that suggest the death was a homicide Frank looks into potential misconduct in the mayor's office.
Erin faces off against her ex-husband in court when he represents the person she is attempting to convict of murder a mother accuses the NYPD of being negligent in solving her son's murder Jamie rides with a new partner.
An ex-NYPD officer goes missing the day after she reveals to Danny her plans to make amends to the woman she and her partner wrongfully convicted years ago Frank faces a dilemma when one of his peers refuses to retire.
Jamie and Eddie suspect foul play when they respond to a distress call from a woman having an allergic reaction to her lifesaving medication Erin learns that a man she convicted of a crime years earlier might be innocent Frank handles a PR crisis.
Eddie and Jamie get involved in an adoption case between birth and adoptive parents and ask Erin to help settle the dispute Frank investigates reports about NYPD cadets cheating on psychological exams Jack plans to enlist in the Marines.
The son of an outspoken critic in the African-American community is murdered a convicted felon's cause of death doesn't match the injuries he received when the prisoner transport van carrying him crashed.
Frank is left with little information to find a missing boy when a conflicted priest refuses to break the seal of confession Danny and Baez look into the death of a socialite with a secret life Jamie and Eddie attend a wedding.
A woman becomes the prime suspect in the murder of her ex-boyfriend Eddie is jealous when Jamie allows a young woman to crash at his apartment an off-duty sergeant fails to intercede during a robbery.
Danny has to work with Anthony to find the killer of a witness Robert Lewis tries to force Frank to publicly support the Attorney General's investigation into the use of excessive force by police.