Bruno's biggest worry at the annual fête in St. Denis is surviving as a last-minute replacement navigator in a car rally race. A young Englishman tells Bruno an intriguing story about a Bugatti Type 57C, lost somewhere in France during World War II. Among the most beautiful cars ever made, it is worth millions and drives its pursuers mad with greed. When two deaths occur during the festivities, Bruno suspects that the events in St. Denis are linked to international crime.