Part-time plasterer and sometime petty thief Frank O'Brien has been commissioned by his dimwit cousin to pull a simple job: just steal a valuable painting and deliver it to a buyer on an upscale New England island. Roz, his had-it-to-here girlfriend who dreams of a more stable--and law-abiding--life, has made him vow that this is the last scam they'll ever be a part of. As they take up temporary residence in a sumptuous, unoccupied beach house on the posh island, two teams of pursuers are hot on their trail: The FBI, led by O'Malley, who still nurtures an obsession with collaring famous art thief Phil the Shill; and a motley crew of half-wit would-be criminals, led by Frank's cousin, Beano, the "mastermind" behind the caper who's discovered the painting is far more valuable than he thought. With their sharp-edged banter and working-class attitude clearly out of place among the upper-crust islanders, Frank and Roz have to spend a riotous weekend just trying to fit in... and get along.