Jim Nashe an ex-fireman, roams the country in his new BMW armed with inheritance money. He picks up a badly beaten stranger, Jack Pozzi a smooth-talking gambler who convinces Nashe to put up his last $10,000 for a sure-win, once-in-a-lifetime card game against two eccentric millionaires he had met. The bizarre millionaires, named Flower and Stone, show Nashe and Pozzi their City of the World, a downscaled model of their life story. Soon, the anticipated card game begins and Pozzi starts to win, Suddenly, his luck turns and Pozzi loses it all, the BMW and $10,000 that neither of them have. Forced to work off their debt, Pozzi and Nashe become slaves to the insane millionaires and must rebuild an immense 15th century castle wall, stone by stone. When Pozzi tries to escape from the fortified estate, he is captured and returned battered and bloody. Angry, Nashe vows revenge and his debt of money becomes a debt of honour.