The Simpsons travel to Ireland so that Grampa can have a final drink at O'Flanagan's Pub - an old watering hole of his. But when the small town of Dunkilderry isn't quite what Grampa remembers it as, and O'Flanagans has become a rundown and empty pub, he and Homer decide to buy it and fix it up.

Homer is sentenced to ten years in jail and in order to reduce his sentence the FBI offers him a deal, so he agrees to infiltrate Fat Tony's mob, undercover.