After an incident where Officer Witten's backup physically could not keep up with a chase, Frank must decide whether to implement a more rigorous fitness test for the NYPD. Also, Danny is hesitant to pursue a cold case after learning who the original detective was; Anthony begs Erin to stall a murder trial so he can gather more evidence; and Eddie is vexed by Jamie's disapproval of her joining a fraternal organization.

Erin must convince Frank to back a new state police bill as part of a bargain she made with Governor Mendez. Also, Danny and Baez pursue the same perp twice after the DA's office is unconvinced by their initial lineup, and Frank faces a challenge when a cop killer comes up for parole.