On Blue Bloods Season 12 Episode 20, Jamie and Joe look for an undocumented teen who was a victim of sex trafficking, and a woman in witness protection is killed.

On Blue Bloods Season 12 Episode 19, when Erin is stalked by a man who was recently released from prison, she enlists Anthony and Danny to investigate.

On Blue Bloods Season 12 Episode 18, a Marine veteran, who is also a local hero, asks Frank to make an exception to the NYPD recruitment age limit.

On Blue Bloods Season 12 Episode 17, Frank is blindsided when Mayor Chase bypasses him with a request for Jamie to head his security detail.

On Blue Bloods Season 12 Episode 16, Frank, Baker, Garrett, and Sid feel guilty when Det. Reddick is shot after being reassigned for not meshing with their team

On Blue Bloods Season 12 Episode 15, Frank contends with public outcry to defund the NYPD School Safety Division, after a physical altercation video goes viral.

On Blue Bloods Season 12 Episode 14, Erin and Anthony team up with Officer Joe Hill, to course-correct a trial when Joe becomes aware of witness tampering.

On Blue Bloods Season 12 Episode 13, Frank contends with a possible dirty cop when an assault on an NYPD detective reveals the officer may be corrupt.

On Blue Bloods Season 12 Episode 12, Frank struggles with how to investigate a wrongful arrest in a murder case divulged to him by his old friend Archbishop Kearns.

On Blue Bloods Season 12 Episode 11, after he is scammed, Danny pursues Dickie Delaney a con artist pretending to be the legendary singer Jimmy Buffett.