The Duo star as a pair of traffic wardens who decide to go on holiday after a mix-up with a member of the Royal Family. They set off in a vintage car but are spotted by a gang of jewel thieves who see an opportunity to use Eric and Ernie as the perfect cover for their smuggling operation. As soon as the two settle into their villa, a rival gang begins to stalk them. Eric and Ernie must foil all the crooks who become most anxious when Eric wins in the casino and plans to buy a new car.