When diplomatic immunity complicates a child abuse case for Danny and Baez, Frank intervenes, despite not having jurisdiction on the case. Also, a robbery occurs while Eddie and Jamie are on a double date with Eddie's boyfriend and his sister, and they are forced to step in.

After Reggie Wilson, a witness in a former case of Erin’s, asks her for help shutting down a drug operation in his apartment building, she makes it her mission to make the building safe for his family. Also, while investigating a teen’s suicide, Danny and Baez uncover information that suggests the death was a homicide, and Frank looks into potential misconduct within the Mayor’s office.

After Danny’s brother-in-law, Jimmy, gets caught up with the mob and steals Danny’s credit card, Danny forces Jimmy to take down the mobsters with Baez’s help. Also, Frank has Erin and Anthony investigate if his old partner, Lenny, is truly guilty of a crime and Jamie is approached by Tariq, an officer who wants his help getting reassigned from his undercover assignment at a mosque.