When Arthur Adel Simpson first spots Harper in the Athens airport, he recognises him as a tourist unfamiliar with the city and in need of a private driver. The perfect mark, in fact, for Simpsons special brand of entrepreneurism, until Harper catches Simpson rifling his belongings and he reveals himself to be a big fish from a big pond, blackmailing the thieving taxi driver into driving a supicious car across the Turkish border. When Simpson is caught, he is forced to spy on Harper and his gang of international jewel thieves.