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A Mexican drug cartel targets Danny when he intercepts a shipment of several million dollars; Jamie goes after a serial killer who preys on the elderly; Mayor Poole confides in Frank that he plans to retire.

Blue Bloods

The Thin Blue Line

Danny and Baez work with two Russian operatives to search for a dangerous Russian who entered the U.S. on a diplomatic visa; Frank gets involved in a sensitive case involving Archbishop Kevin Kearns.

Foreign Interference

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.

No Retreat No Surrender

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.

Love Lost

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.

A Deep Blue Goodbye

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.

Shadow of a Doubt

Linda's brother, Jimmy, gets into trouble with the mob and asks Danny to help him stay safe; the lawyer of a wrongfully arrested man demands that NYPD officers' disciplinary records be made public; Nicky goes on a ride-along with Jamie.

Hard Bargain

Danny and Baez investigate the murder of a man who killed a mother and son years earlier while he was driving drunk; Anthony is conflicted when Erin asks him to wear a wire to incriminate a friend.

Lost Souls

Danny and Baez investigate the murder of a gang leader and learn the accused shooter is an ex-con who is romantically linked to his parole officer, who might be assisting in a cover up.

In & Out

Frank intervenes when diplomatic immunity complicates a child abuse case; a robbery takes place while Eddie and Jamie are on a double date, and they are forced to take action.

The One That Got Away

Danny takes a side job as a bodyguard for a released ex-con who took the fall for someone else; Gormley's wife asks Frank to give Gormley a bigger command position; Jamie and Eddie reflect on their relationship.

Not Fade Away

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.

Genetics

New York Police Commissioner Frank Reagan heads a multigenerational family of police officers dedicated to enforcing the law in New York.

S7 E22 | The Thin Blue Line