Tommy strong-arms the mayor for his support of a development deal, but hits a roadblock due to Michael's business dealings; Rose investigates her mysterious ailment; Eileen is passed over for promotion due to her pregnancy.
A fire kills several Latino squatters and a firefighter, leaving Tommy struggling with the political fallout; Colin's torch for Michael's girlfriend Kath begins to affect his work; Declan uncovers a lead and brings in another investigator.
The Labor Day holiday weekend finds Michael increasingly paranoid and edgy; Tommy proposes a radical lifestyle change to Eileen; Declan and Cassie's getaway highlights the growing problems in their rocky marriage.
Eileen worries that her family will never leave The Hill when Speaker Donatello draws Tommy back in to help pass the budget; Declan tries to link Tommy with Nozzoli; Rose's attachment to Colin fuels Michael's anger and paranoia.
Kath and Colin worry about what Michael might be capable of if he becomes too suspicious of their relationship; Eileen goes stir crazy when her pregnancy confines her to bed; Tommy asks for Michael's help with the Waterfront investigation.
Tommy becomes heir apparent for Speaker when Donatello's condition worsens; Freddie maneuvers to get on Tommy's good side. With the mob, the state police, and feds after him, Michael's obsession with Colin puts everyone in jeopardy.