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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.
Erin protects a witness while Danny investigates an off duty police officer who got disarmed during a bank robbery by a couple reminiscent of Bonnie and Clyde on Blue Bloods.
Danny and Erin team up to solve a cold case involving a rich man who got away with attacking his girlfriend on Blue Bloods.
After being accused of being too aggressive while working a case, Danny must attend anger management classes while Frank tries to save a Turkish woman from persecution on Blue Bloods.