Sweeney lets Roarke sell cocaine only if he sources it himself, putting him in Gotti's crosshairs as Gotti suspects the Westies are defying Castellano; Bridget helps Cahill secure explosives for their IRA plot; Polk pressures Keenan to wear a wire.

Tensions between Sweeney and Roarke erupt when one of the Westies is busted; Keenan uses the case to pressure Sweeney and earn Polk's trust; Flanagan's personal life unravels; Bridget pushes deeper into her mission as Cahill's motives blur.