The family argues over Danny's questionable tactics as he searches for a missing girl.
A good Samaritan with a police record takes action against a terrorizing subway criminal.
The main suspect in a rape case is protected by diplomatic immunity.
An off-duty police officer is murdered during a diamond heist.
Danny, Frank and the rest of the NYPD search for a homemade bomb about to detonate.
Danny tries to find the source of a deadly narcotic after three teenagers die from an overdose.
The family questions Erin's tactics when she tries to take down a gang leader.
Danny has to help Jamie avoid an internal affairs investigation.
A Reagan's life is in danger after three criminals are released from prison.
Danny investigates when a doorman at a nightclub is murdered.
A high-end escort's body is found in the river; Frank vows to get justice in a 25-year-old case.
Danny delves into the politics of the Russian mob while investigating the death of a gangster's son.
Danny investigates the shooting of an undercover counterterrorism agent.
When a girl is kidnapped, Jackie and Danny suspect her drug-addicted boyfriend is responsible.
Danny tries to hunt down the shooter who attempted to assassinate Frank.
A young girl is murdered at a debutante ball; Nicky rides along with Danny as he investigates.
Danny vows to find the killer of a war hero who was homeless.
After Danny witnesses a murder, a member of his family is put in jeopardy.
A reporter and Linda's niece, a runway model, collapse at a fashion show.
Frank becomes frustrated when a tourist's murder is sensationalized in the media.
Suspicion falls on an alcohol and drug addict when his family is murdered; Jamie's gun disappears.
In an effort to expose the Blue Templar, Frank decides not to report a case that reveals dirty cops.