Michael plays a game of Russian roulette with the mentally challenged brother of a neighborhood store he wants to take over. Tommy is working on keeping a highway spur from going through the hill by wheeling and dealing behind the scenes. Eileen gets some upsetting news at the doctor's office.

Tommy sees an opportunity to make some money when the governor asks him to introduce a bill that would create jobs on the hill but would also tear down some houses. Michael deals with Armenian drug dealers working out of a local bar. Rose fights back when they want to lay off 25 workers at the mill.

Rose plans a surprise birthday part for Michael. Tommy decides to play dirty to be the majority leader.

As Tommy begins his re-election campaign, he turns to his sister, Mary-Kate, rather than Eileen for support. Colin Carr, Tommy and Michael’s estranged Irish cousin, returns to Providence – an event Rose views with deep distrust. Michael and Moe team up for a truck heist while Declan and Cassie have dinner with Cassie’s parents.

Rose causes problems between Tommy and Michael. Michael messes up Tommy's real estate deal. Freddie asks Declan for some help. Tommy and Dana get closer.

Michael goes after more power while he and Kath get ready for their little addition to the family. Tommy tries to fix the problems in a bad area of The Hill. Eileen learns from other politicians wives.

Declan gets a new assignment from the FBI. Eileen is in for a shock when she becomes a volunteer at social services. Tommy is feeling pressure to become Judd's replacement as chairman of a committee. Michael and Collin enter a partnership with Nozzoli.

It's Thanksgiving and Rose is fed up with everyone. She leaves and they are forced to figure things out on their own. Freddy and Marty Trio use some information to get a holiday furlough from prison.

Unhappy being the speaker's lackey, Tommy explores the possibility of leaving politics. Rose's birthday party attracts both of her feuding sons. Declan is offered an opportunity to investigate government corruption.

Over Labor Day Weekend Tommy, Eileen and the family spend the holiday at a water front property where Tommy surprises Eileen with his plans for their new home away from the hill, his mom and Michael but Eileen won't let her self believe it until it happens. An incident at Nozzoli's barbeque pushes Michael's growing paranoia into overdrive. The absence of Kath and Colin who have gone away together does little to ease his mind. Declan and Cassie get away for a romantic weekend, which is ruined by their past marital difficulties.

Michael returns to Kath but she and Colin begin to worry as the FBI fuels Michael's suspicions about their relationship. Eileen is confined to bed rest for the duration of her pregnancy. Tommy seeks Michael's assistance as Declan begins to zero his investigation in on the Waterfront Project.