Frank struggles after Joe Hill's lineage as a Reagan is revealed; Erin and Anthony receive gift-wrapped evidence; Danny's opposition to authority clashes with Jamie's adherence to the rules, as both brothers work to solve a murder.

Eddie and her partner, Officer Rachel Witten, are heralded for their bravery for stopping an active shooter, until a civilian comes forward to accuse them of faking the incident as part of a government conspiracy. Also, Frank pries into a decades-long history of cash payments his father Henry has been making to an unknown recipient, Danny and Baez find themselves in the middle of a fierce sibling rivalry between two brothers as they investigate the murder of the men's father, and Sean contends with his school locker being vandalized with anti-police sentiment.