Diamond thief Franky Four Fingers (Benecio Del Toro) arrives in London en route to New York to deliver a huge diamond to boss Avi (Dennis Farina). But after offloading smaller stones to a motley assortment of London ne'er-do-wells, Franky - and the diamond - fall into the wrong hands. Meanwhile two shady boxing promoters discover Irish gypsy fighter Mickey O'Neil (Brad Pitt), whom they hope to ride to riches if he will only “take a fall” as instructed. When Avi arrives in London looking for his diamond, all hell breaks loose as various parties pursue personal agendas?all of them illegal, some of them farcical, and most of them destined to end in pain and retribution. As a plan goes haywire and tempers fray, dogs, diamonds, mobile homes, boxers and assorted weaponry get swept up into a chaotic free-for-all.