When an assassination attempt is made on Frank's life, Danny goes on a hunt to track down the shooter and find out if the attack was random or by someone with a vendetta against the Commissioner.

In his attempt to expose the Blue Templar, Frank chooses to bypass Internal Affairs after a drug bust indicates dirty cops are involved.

Frank is put on the spot when a supporter for the mayor is found dead and the mayor wants Frank to position it as a random act of violence to the public. Meanwhile, Jamie goes on his first undercover assignment at a bar where meets and bonds with a suspicious patron.

Even while on a case, Danny tries to swing a romantic weekend with Linda. Jamie's undercover assignment involves a crime family.

Danny accompanies a dangerous ex-mobster who is helping him find bodies on cold cases in exchange for leniency for his son on grand theft auto. Meanwhile, Jamie works undercover in a boiler room operation, looking for a secret about the Sanfino family.

When Frank’s close friend, a high-profile reporter, is almost assaulted while in town investigating a story, Danny and Jackie attempt to track down her would-be attacker. Meanwhile, Jamie’s undercover case comes to a head.

Danny and Jackie investigate the suspicious murder of a high rolling investor, who had injuries from a fight, but no marks on his hands. Meanwhile, Frank puts Jamie under house arrest, when the Sanfino family put out a hit on "Jimmy Reardon".

When a knife-wielding attacker dressed as Baron Samedi, the Spirit of Death, stabs a man in costume on Halloween, Danny enters the world of voodoo. Meanwhile, DCPI Garrett opens up to Frank about a dark secret, and Erin and Nicky take Jack and Sean trick-or-treating.

When a man with multiple rat bites is thrown from a moving car, Danny works the case to find out why and who was trying to send a message. Meanwhile, Frank must be diplomatic when dealing with a bigoted radio host who will be broadcasting from New York City.

As the Reagans rally together to take down the leader of the gang responsible for the murder of someone close to them, Danny looks to the gang leader’s girlfriend to lead them to him. Meanwhile, Frank is left reeling from a second loss.

When a famous movie star, Russell Berke, who shadowed Danny for research on his next role, is stabbed, Danny goes to his aid, but must keep the crime on the down-low due to Russell's celebrity status.

Danny is after the distributor of a deadly new street drug.

Danny uncovers shocking information while investigating a case against orders.

When a suspect voluntarily admits to killing a reality show celebrity chef in his own restaurant, Danny and Baez are convinced the suspect is taking the fall for someone. Also, Frank faces a moral dilemma when a longtime friend, Sen. Ted McCreary, asks for Frank’s help to make a DUI go away, and investigative journalist Anne Farrell returns.

When Danny accepts a side job as a bodyguard for a recently released ex-con who took the fall for someone else, he uses the opportunity to go after the real criminal. Also, Gormley's wife, Sheila, asks Frank to give Gormley a bigger command position, and Jamie and Eddie witness a lovers' quarrel between two cops that leads them to reflect on their own complicated relationship.

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.

Eddie's judgment is clouded by her past when she arrests a loathed acquaintance from college on questionable charges. Also, Frank is hesitant to mar the spotless record of a member of the force, a decorated U.S. military veteran, who tested positive for marijuana.

When a series of drive-by murders occur after six wrongly convicted men are released from prison, Danny and Baez wonder if they were orchestrated by the men as an act of revenge. Also, Frank combats the guilt he feels about these innocent men unfairly serving nine years in prison, and Jamie and Eddie find themselves in a life-threatening situation.

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 grapple with a homicide investigation brought to their attention by Maggie, the medium who previously helped them solve a case; Frank looks for a way to help his ex-partner Lenny Ross when Lenny's daughter gets arrested.

Frank is conflicted about how to deal with former cop Rick Austin’s gripe about his pension. Jamie helps a friend, Connor O’Brien, deal with illicit pictures of his daughter on the internet. Danny hunts down a killer who shot his online prison pen-pal. Anthony confronts the realization that his foster son, Sam, might not be suited for police work.

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.

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.

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.

Danny and Baez team up with Danny's old partner to find a copycat killer emulating a criminal's murders from a previous case; Frank and Mayor Chase battle over how best to handle the city's rising homeless population.