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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.
Danny and Jamie are both devastated when a young woman takes her life and that of her infant son in order to escape gang violence on Blue Bloods.
A man found covered in his girlfriend's blood claims he has no memory of what occurred and Jamie's good intentions end up making matters worse for a fellow cop on Blue Bloods.
Linda refuses to let Danny question a suspect before surgery. A fierce argument ensues when the suspect doesn't survive on Blue Bloods.
When a devoutly religious woman is found dead in a cemetery, Danny and Detective Baez find out she had several secrets on Blue Bloods.
Danny works to link a series of seemingly random cases while Frank tries to help an old friend suffering from alcoholism on Blue Bloods.