Hanaud, however, did not dismiss the point so lightly. "But it is very possible that it does matter," he said gently. "For example, if Servettaz had had no reason to examine his tins it might have been some while before he found out that the petrol had been taken." "Indeed, yes," said Servettaz. "I might even have forgotten that I had not used it myself." "Quite so," said Hanaud, and he turned to Besnard. "I think that may be important. I do not know," he said. "But since the car is gone," cried Besnard, "how could the chauffeur not look immediately at his tins?" The question had occurred to Ricardo, and he wondered in what way Hanaud meant to answer it. Hanaud, however, did not mean to answer it. He took little notice of it at all. He put it aside with a superb indifference to the opinion which his companions might form of him. "Ah, yes," he said, carelessly. "Since the car is gone, as you say, that is so." And he turned again to Servettaz. "It was a powerful car?" he asked. "Sixty horse-power," said Servettaz. Hanaud turned to the Commissaire. "You have the number and description, I suppose? It will be as well to advertise for it. It may have been seen; it must be somewhere." The Commissaire replied that the description had already been printed, and Hanaud, with a nod of approval, examined the ground. In front of the garage there was a small stone courtyard, but on its surface there was no trace of a footstep. "Yet the gravel was wet," he said, shaking his head. "The man who fetched that car fetched it carefully." He turned and walked back with his eyes upon the ground. Then he ran to the grass border between the gravel and the bushes. "Look!" he said to Wethermill; "a foot has pressed the blades of grass down here, but very lightly--yes, and there again. Some one ran along the border here on his toes. Yes, he was very careful."