American Grant Decker is in Paris on a photography assignment. When he arrives at Gare du Nord train station, he discovers just how unprepared he is to navigate this new world where the language is both vaguely familiar and baffling. '"Vous ne parlez pas fran?ais?" My brain turned around three times and then went to sleep!' Determined to get his bearings, Grant explores the length and breadth of the city on the metro. But it is when...