On a cold, damp night last November, a Mercedes sedan looped through the semicircular drive of the St. James Paris, a century-old chateau-style hotel across the Seine from the Eiffel Tower. As the car rolled to a halt at the hotel’s main entrance, a well-tailored trim man named Ely Calil walked unhurriedly out the lobby door and down wide stone steps, talking into an earpiece that was connected, through a thin black wire, to a tiny cell phone tucked in the closed palm of one hand. The driver stepped from the car and opened the door for Calil, who…