Harriet and Peter Fox are a pair of badly behaved British con-artists. After they suffer a huge loss in poker to a psychotic gangster, Irina, they flee to Los Angeles to try and buy time until they can come up with the money. They concoct a convoluted plan to steal a ring from Peter's rich ex-wife Jackie. After several failed attempts and crazy shenanigans, the couple manages to evade Irina, fool Jackie, and get the ring. The two sell the ring and decide to retire to Brazil and give up their life of crime. However, as they board the plane, a very pricy diamond necklace around a passenger's neck gives them other ideas