After stealing an 86-carat (17.2 g) diamond in a heist in Antwerp, Franky "Four-Fingers" goes to London to see diamond dealer Doug "The Head" on behalf of New York jeweller "Cousin Avi". One of the other robbers advises Franky to obtain a gun from ex-KGB agent Boris "The Blade". Meanwhile, Boris then plans to steal the diamond from him before he can turn it over to Doug.
Meanwhile, boxing promoter and slot machine shop owner "Turkish" persuades gangster "Brick Top" to put boxer "Gorgeous George" in a matchup against one of Brick Top's boxers. However, when Turkish sends his partner Tommy and Gorgeous George to purchase a caravan from a group of Irish Travellers, George gets into a fight with Mickey O'Neil, a bare-knuckle boxing champion who badly injures George. Turkish persuades Mickey to replace George in his upcoming match by agreeing to purchase a new caravan for Mickey's mother. Brick Top agrees to the change on the condition that Mickey throws the fight in the fourth round.