Several days passed, and Derues flattered him self the danger was over: his every action mean while was most carefully watched, but so that he remained unaware of the surveillance. A police officer named Mutel, distinguished for activity and intelligence beyond his fellows, was charged with collecting information and following any trail. All his bloodhounds were in action, and hunted Paris thoroughly, but could trace nothing bearing on the fate of Madame de Lamotte and her son. Mutel, however, soon discovered that in the rue Saint Victor, Derues had failed—three successive times, that he had been pursued by numerous creditors, and been often near imprisonment for debt, and that in 1771 he had been publicly accused of incendiarism. He reported on these various circumstances, and then went himself to Derues’ abode, where he obtained no results. Madame Derues declared that she knew nothing whatever, and the police, having vainly searched the whole house, had to retire. Derues himself was absent; when he returned he found another order to appear before the magistrate. His first success had encouraged him. He appeared before the magistrate accompanied by a lawyer and full of confidence, complaining loudly that the police, in searching during his absence, had offended against the rights of a domiciled burgess, and ought to have awaited his return. Affecting a just indignation at Monsieur de Lamotte’s conduct towards him, he presented a demand that the latter should be declared a calumniator, and should pay damages for the injury caused to his reputation. But this time his effrontery and audacity were of little avail, the magistrate easily detected him in flagrant lies. He declared at first that he had paid the hundred thousand livres with his own money but when reminded of his various bankruptcies, the claims of his creditors, and the judgments obtained against him as an insolvent debtor, he made a complete volte-face, and declared he had borrowed the money from an advocate named Duclos, to whom he had given a bond in presence of a notary. In spite of all his protestations, the magistrate committed him to solitary confinement at Fort l’Eveque.