When an assistant U.S. attorney overdoses and ends up left for dead, Decourcy Ward suspects Jackie Rohr's involvement

As Decourcy increases pressure on the Justice Department, Jackie counters by looking into his adversary’s romantic past. While Jackie’s digging up dirt, Siobhan is planning ahead, focused on starting a family even as Decourcy remains preoccupied by the escalating conflict. Jenny realizes she can’t keep ignoring her mother after an unsettling phone call

Jackie uncovers one of Decourcy’s informants and hatches a plan to use him as a pawn to discredit the assistant district attorney. Decourcy stops by the Rohr house, hoping to get something out of Jenny that he can use against her husband. Siobhan receives some welcome news, in the midst of plotting her run for City Council

After seeing Holly in the ICU, Jackie reckons with the destructive consequences of his actions, as Rickey Townsend prepares to testify against Decourcy. With violence intensifying between the Copeland Crew and the Braxton Boys, Decourcy, Anton and Siobhan face off in the interrogation room. Grace, left reflecting on her role as a mother and leader in the community, makes an unfortunate miscalculation

As U.S. Attorney Karen Shimizu tries to get rid of her troublesome agent once and for all, Jackie schemes his way into a new mission

With Anton on the lam, Kelvin struggles to lead the Braxton Boys and Jackie homes in on Grace. He knows she's hiding something. Sidelined from the investigation, Decourcy finds himself at a disconnect with Siobhan, as he seeks vengeance and she focuses on recovery

Assuming the involvement of the Campbell brothers at the Copeland territory shootout, Jackie confronts Grace, who can no longer sidestep her sons’ criminal activity. She is forced to make a terrible compromise. Resenting the outcome of a negotiation that he could not take part in, Decourcy finds comfort in the strength of Siobhan, who keeps her head even after tragedy strikes

As Boston mourns another loss, Decourcy pursues justice in and out of the courtroom. Despite his maneuvering, Jackie discovers that he can’t escape his past, while Jenny decides to finally confront hers. Cathy says goodbye to the root of her struggles