"Was it really a slip, or not?" he asked himself.

"These wretches have been terribly punished," pursued M. Plantat, "and it is impossible to pity them; all would have gone rightly if Sauvresy, intoxicated by his hatred, had not committed a blunder which was almost a crime."

"A crime!" exclaimed the doctor.

M. Lecoq smiled and muttered in a low tone:

"Laurence."

But low as he had spoken, M. Plantat heard him.

"Yes, Monsieur Lecoq," said he severely. "Yes, Laurence. Sauvresy did a detestable thing when he thought of making this poor girl the accomplice, or I should say, the instrument of his wrath. He piteously threw her between these two wretches, without asking himself whether she would be broken. It was by using Laurence's name that he persuaded Bertha not to kill herself. Yet he knew of Tremorel's passion for her, he knew her love for him, and he knew that his friend was capable of anything. He, who had so well foreseen all that could serve his vengeance, did not deign to foresee that Laurence might be dishonored; and yet he left her disarmed before this most cowardly and infamous of men!"

The detective reflected.

"There is one thing," said he, "that I can't explain. Why was it that these two, who execrated each other, and whom the implacable will of their victim chained together despite themselves, did not separate of one accord the day after their marriage, when they had fulfilled the condition which had established their crime?"

The old justice of the peace shook his head.