Maggie calls in Remy to aid Scola in his undercover mission to find the terrorists believed to be responsible for the imminent attack in New York.
The shooting of a federal corrections officer leads the team to an ex-Marine who has gone rogue ever since he returned from Afghanistan Tiffany's sister looks to her for guidance when their younger brother begins to lash out.
When an off-duty diplomatic security agent is fatally shot in New York City trying to apprehend someone, the team investigates if there's a connection to his time working in Croatia.
On Christmas Day, Sonny and Will race to find a necklace.
Sonny's search for a home-cooked Christmas dinner leads to a treasure hunt.
Will hits a winning streak in Las Vegas.
Erin and Frank clash over new legislation from the district attorney's office that undermines Frank's policies Erin is at odds with Governor Mendez over questionable sex-trafficking laws Danny risks his badge to protect a friend from losing his.
Things get personal for Danny when the drug cartel hit man responsible for torching his house resurfaces an attack on an officer in the line of duty directly impacts a member of Frank's team Eddie reluctantly introduces Jamie to her mother.
Jamie clashes with Eddie and her new partner when they fail to intervene in a dispute at a convenience store Danny and Baez investigate the death of a college freshman at a fraternity party a sergeant accuses the department of reverse racism.
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.
When a series of drive-by murders occurs after six wrongly convicted men are released from prison, Danny and Baez wonder if the murders were orchestrated by the men as an act of revenge Frank combats feelings of guilt.
Frank locks horns with a data-tracking company when it refuses to unlock a terrorist's phone that may hold information regarding upcoming targets Erin obtains information about an impending murder from a shady source a woman kidnaps a baby.
Danny resorts to asking his incarcerated archenemy for help locating a dangerous criminal who escaped from prison Lugo refuses to assist unless he's allowed to accompany them on the pursuit Frank tries to convince Jamie to take the sergeant's test.
Danny and Baez race to find a missing girl who will die without her heart medication Jamie and Eddie are on the wrong side of an investigation after engaging in a car chase Sean wins an essay contest.
A woman voices outrage over her son's unsolved murder Danny re-examines the case Eddie gets shot while on duty Erin and her ex-husband face off in court Frank deals with an angry police force after the mayor fails to defend it.
Danny forces his brother-in-law to help Baez take down the mobsters he's mixed up with Frank suspects his old partner is guilty of a crime Jamie is approached by an officer who wants help getting reassigned from his undercover assignment.
A man living a double life with two separate families is murdered Erin asks Anthony to help investigate his former partner Frank deliberates between two candidates for the chief of transit position.
The team is asked to provide security for a supposedly peaceable cult, but Johanna is drawn to the organization.
A wounded criminal with a rare blood type escapes from a hospital.
A director wants to know who or what is causing dangerous "accidents" on a movie set.