move. Meanwhile Major de Trouville took his departure, promising to keep in communication with the Air Service boys.
Punctual to the half hour a taxicab appeared at the door. The boys obeyed the instructions they had received, and looked out to make sure the spy was not on hand. If he was, he was well concealed, for they did not see him.
"Though I suppose he's somewhere around," said Jack.
"Well, maybe we can fool him," suggested Tom. "We're going quite on the other side of Paris."
They made sure that, as far as could be told by observation, there was no one resembling the spy around the place or in the street in front, and then got into the cab with their baggage. The chauffeur seemed not to know them, but Tom thought there was just the slightest wink of one eye, as though to indicate that the game was going well.
Their cab was driven out along the Boulevard Ragenta, past the Gare du Nord, and across the Boulevard de Rochechquart to a small street running off the Rue Ramey, and there the cab stopped in front of a small but neat-looking house.
"Quiet enough neighborhood," remarked Jack, as they got down, and Tom tipped the
