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Danny has to investigate a childhood friend who now has ties to the mob on Blue Bloods.
Danny and Baez meet with resistance while investigating a bombing. Frank deals with the fallout after a man punches an officer he feels was aggressive on Blue Bloods.
Danny and Baez investigate a murder where the prime suspect turns out to be her brother on Blue Bloods.
Danny serves on a jury and finds that he disagrees with most of the jurors on the case while Frank gets a little too close to a hit on a mob lawyer on Blue Bloods.
An accusation of excessive force has the mayor threatening to charge an Officer with murder on Blue Bloods.
Jamie's conduct is called into question when a gang member he chased is injured and Danny's ex-girlfriend returns to cause trouble on Blue Bloods.
When Erin is taken hostage at the courthouse, Danny becomes the main hostage negotiator and Jamie faces the consequences when he goes against his lieutenant's orders on Blue Bloods.
Danny's ability to be discreet about a film star shadowing him on the job becomes compromised when the star gets stabbed on Blue Bloods.
When an NYPD police officer is killed during an armed robbery, Frank makes it his mission to see the guilty parties brought to justice but tensions rise at home when Erin drops the charges due to lack of evidence on the season 4 premiere of Blue Bloods.
Frank is further unnerved when a second crisis comes on the heals of the Reagan family's crusade against the the gang leader who killed Jamie's partner on the season finale on Blue Bloods.