Frank goes on high alert when a threat to New York City may be imminent following a terrorist attack in the Middle East.

A possible serial-killer case is assigned to Danny and Baez. Erin considers becoming a judge; a mayoral candidate claims that Frank has been secretly investigating her spouse; and Eddie confronts her dad.

When a newspaper reporter is targeted while wearing NYPD gear during a ride-along, Frank thinks the shooter is targeting cops.

One of Erin's informants leaves witness protection to give his former boss an alibi; Frank and the New York City fire department commissioner get into a war.

Danny joins the search for two escaped convicts after learning that one is someone he helped wrongfully imprison.

Camera footage appears to show Jamie committing police brutality at a demonstration; a civil rights attorney claims a rape case includes drummed up charges.

The only remaining Mustang driven by Steve McQueen in "Bullitt" is stolen; an order from the acting district attorney puts Frank and Erin at odds.

Linda is concerned when an elusive serial killer starts threatening her, Danny and their kids; during a hostage situation, Jamie challenges a superior officer.

DA Investigator Anthony Abetemarco helps Erin when she is forced to take a case from a colleague, ADA Kelly Blake; Eddie and Jamie pose as an elderly couple in order to catch a gang.

Danny is interrogated by the District Attorney's investigator when his ex-partner is accused of planting evidence in order to wrap up a homicide case. Also, when radical anti-government activists threaten to publicly burn an Ameri...

Frank worries that a tell-all book about his old cop days will affect his career as PC. Meanwhile, Erin and DA Investigator Abetemarco investigate the murder of another DA Investigator in a bar where they wind up in a conspiracy.

A mobster is found shot in his car and his low-level errand boy is tied up in the trunk; an NYPD officer asks for a new shield number -- the same number as Frank's deceased son Joe.

Frank deals with the aftermath of a retired cop who shot his mugger. A trainer flouts authority, mingling with Janko. A man Baez saw kill her friend 25 yrs. ago has returned; she and Danny figure out how to bring him to justice.

Four gorgeous women used in a local brothel admit to murdering their evil boss. Danny and Baez must figure out the real killer. Frank and his priest argue over mercy in the Catholic Church while Nicky Reagan-Boyle gets in drug tro...

Erin is overwhelmed with guilt after a man she set free is accused of killing a cop. Also, Frank and Mayor Poole continue their game of political chicken over Frank's reappointment as commissioner, and Danny and Maria investigate ...

The newest Speaker of NY City Council, (Whoopi Goldberg), a chronic malcontent, wants to dismantle the NYPD's "Broken Windows Policy," a position Frank vehemently opposes. Erin worries when the wife of her good friend and mentor, ...

Jamie and Danny disagree about how to handle a reckless NYPD rookie, Marcus, who is the son of Dannys friend. Also, when Erins investigator, Anthony, gets roped into a bad investment by his cousin, she offers to look into it.

Frank and Danny Try to help a rehabilitated ex-con when he becomes involved in the murder of an enemy; a former prosecutor withholds the location of an alleged killer from Erin as she prepares for the trial.

An officer involved in the controversial shooting of an unarmed person 14 years prior, is up for a promotion which brings up mixed feelings from various NYPD officers, in addition to forcing Frank Reagan to make a difficult decision.

When serial killer Thomas Wilder (Louis Cancelmi) attaches a message to his latest victim that taunts Danny, their deadly game of cat and mouse becomes personal for Danny.

Erin Reagan searches for a missing trial witness who is on the run because of fear of retaliation.

In the Season 6 finale, public outrage erupts when a cop isn't indicted for shooting a teenager, and the fallout affects Frank, the mayor and Erin's office. Later, an officer gets shot in a possible case of retaliation, so Danny s...