"I pray you, Monsieur Fernand," he said, "do not let us linger here. This is an affair for the local police, and we must get to Mantes before dark."

"You need not linger, Monsieur le Commissaire," rejoined the Man in Grey. "I pray you, tie my horse to the nearest tree and continue your journey, if you have a mind."

He had risen to his feet and appeared to be examining the ground closely all round the spot where lay the body of the murdered man. M. Gault uttered one of his favourite oaths. Indeed, he had no mind to continue his journey alone, with those murdering footpads lurking in the woods and the road to Mantes lonely and unsafe.

"What are you looking for now, Monsieur Fernand?" he queried sharply. "Surely, the police of Mantes can deal with the affair. Are you looking for traces of the miscreants?"

"No," replied the other, "I am looking for the murdered man's boots."

"The murdered man's boots!" exclaimed the commissary crossly. "Why, the fellow is just a rough peasant, and no doubt he walked barefoot."

"No doubt," agreed the Man in Grey.

Nevertheless, he continued his search and even plunged into the thicket, only to emerge therefrom in a minute or two, as the darkness made it impossible to distinguish anything that might be hidden in the undergrowth.

"I don't know why you should be so obstinate about those boots!" growled the commissary.

But to this remark the Man in Grey vouchsafed no reply. He had resumed his mount and was already in the saddle.