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On Blue Bloods Season 9 Episode 21, Danny and Maria investigate a case involving a set of identical twins who appear to have identical alibis.
On Blue Bloods Season 9 Episode 20, Erin needs Frank's support when the governor calls in the favor she owes him, while Danny and Baez must pursue the same perp twice.
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.