Michael struggles to recover from a brutal beating while consolidating his power. Tommy maneuvers to win reelection as he distances himself from his brother's criminal activities. Rose sows unrest between her sons.
Tommy outmaneuvers U.S. Attorney Ellis Franklin as he and Eileen struggle to keep up the appearance of a happy marriage. Michael, who has no memory of his attacker at the wedding, tries to re-establish his territory with Freddie and asks Declan to investigate the source of his head injury. Declan spirals out of control as he finds himself shut out at work and at home.
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.
Colin helps Michael and Eileen cope with the unexpected death of a friend while Freddie tries to avoid a war with the Italians; Tommy helps smooth things over with the Speaker of the House's mistress.
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.
Tommy doesn't get support from the usual places while struggling to stay on track. Michal looks to make some changes in his life. Colin searches for his father. Freddie asks Declan for help in finding someone.
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.
Election day is here and Tommy is behind in the early exit polls. Michael goes with a hit man as a favor. Kath turns to Colin for help and he takes her to an abortion clinic.
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.
Freddie tries to get Nozzoli's help involving Michael. Tommy goes after the Speaker's chair. Eileen has had enough and confronts Tommy about his relationship with Dana. After losing someone close to them Colin and Rose become closer. The US Attorney's office investigates Freddie's furlough.