"No, Vernet, I haven't forgotten that. In fact, I am coming to it now. Suppose you were in this fellow's place—how would you do it?"
Vernet scratched his head thoughtfully. "He might fire a pistol from the car."
"Too dangerous. The noise of the explosion would attract attention. He must work silently."
"A wave of the hand, perhaps, to someone along the street."
"Also dangerous. This fellow realizes that every possible step will be taken to capture not only himself, but his confederates. He anticipates, no doubt, that the road will be carefully watched. Why take chances, and run the risk of his confederates, at least, being arrested, when there are simpler, easier ways?"
"Such as what?"
"Do you not remember the signal, used on the Versailles road, the blue light?"
"Ah! Exactly. He will signal to some one in a house along the way."
"That would be easier and safer; but you will remember that there are no houses along the way—none, at least, in which a man of this sort could have a confederate hidden. But I should not say none. There is one, perhaps."
"Indeed, Monsieur. And what house is that?"