The life of politician Tommy Caffee (Jason Clarke) gets complicated when his gangster brother (Jason Isaacs) returns home to Providence, Rhode Island.
Tommy turns to his sister for help on his re-election campaign and Tommy and Michael's estranged cousin returns to Providence.
Rose sows unrest between her sons, Freddie asks Declan to negotiate with the competition and Tommy and Dana see more of each other.
Tommy's plan to extricate himself from political entanglements hits a snag when Speaker Donatello seeks his help passing the budget. Declan learns more about Tommy's involvement in the Waterfront Project and connects Tommy to Nozzoli. Elsewhere, Michael's jealousy over his mother's attachment to Colin adds fuel to his paranoia about Colin and Kath.
Unhappy being the speaker's lackey, Tommy explores the possibility of leaving politics, Rose's birthday party attracts both of her feuding sons, and Declan is offered an opportunity to investigate government corruption.