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On the Blue Bloods season 4 finale, Danny stumbles upon a case in which the implications of internal involvement set off alarm bells for Frank.
A cop from Danny's squad is killed and Frank finds out something unexpected about the man's personal life. Nicky asks Jamie for help finding a friend living on the streets on Blue Bloods.
Frank is unhappy when Erin is assigned the case of a cop accused of killing a suspect in his custody on Blue Bloods.
Danny finds out that the District Attorney's office in investigating him for ethical and procedural violations and that his father knew and failed to tell him on Blue Bloods.
Danny and Baez must figure out what happened when a woman dies soon after undergoing secret plastic surgery while Frank puts Jamie on an off the books case on Blue Bloods.
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.