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Danny and Baez investigate a when an expectant mother finds herself of the victim of a knockout game on Blue Bloods.
Danny scrambles to find a woman who calls him to say she's going to kill the drunk driver who killed her parents and then herself on Blue Bloods.
The investigation into a missing girl brings back difficult memories for Danny who worked a similar case that he failed to solve on Blue Bloods.
Danny and Baez investigate when a drag queen from a reality TV show is found murdered in a park. Meanwhile Erin is abducted by a man's mother just before his trial on Blue Bloods.
Danny thinks a Marine who beat his wife and kidnapped his son is suffering from PTSD on Blue Bloods.
When a deadly new type of heroin hits the streets, Danny goes after the distributor, Frank takes on another route on Blue Bloods.
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.
The kidnapping of a little girl takes an odd turn when her parents refuse to admit she was abduction and Frank must handle a police chaplain who was let go on e DWI on Blue Bloods.
Danny must figure out if a teenage girl was actually pushed onto the subway tracks and Frank has to handle the new Inspector General 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.