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Danny teams up with his arch nemesis Luis Delgado to take down a vicious murderer who killed Delgado's wife and may also be responsible for Linda's death.
Frank has a decision to make about fitness standards after an officer is not physically able to provide backup while his partner is chasing a suspect.
On Blue Bloods Season 9 Episode 17, Frank's longtime friend reveals that an exposé will air the NYPD's dirty laundry and Jamie looks into a corrupt officer.
On Blue Bloods Season 9 Episode 16, someone from Jamie and Eddie's past begins a smear campaign against them and Danny and Baez investigate a complicated murder.
On Blue Bloods Season 9 Episode 15, Danny encounters a robbery in progress and is forced to use his weapon, leaving him shaken and his family concerned.
On Blue Bloods Season 9 Episode 14, Danny goes against Jamie's direct order, and Nicky's friend claims he's accused of a crime he didn't commit.
On Blue Bloods Season 9 Episode 13, Erin's ex-husband asks her for help with an assault and robbery case and Frank goes against the wishes of the archbishop.
On Blue Bloods Season 9 Episode 12, Danny and Baez investigate the murder of a star college basketball player and Frank considers reinstating an officer.
On Blue Bloods Season 9 Episode 11, Jamie tries to rely less on Frank's input and Erin helps Anthony protect his daughter from a dangerous psychiatric patient.
On Blue Bloods Season 9 Episode 10, Frank wants to know who leaked a video showing officers in a possible case of entrapment, and someone is pranking Jamie.