The half-crazed man made his way to the Seine embankment, where he walked up and down, trying in vain to think calmly. When he left the Baroness de Martigny's house with the stolen jewel-case he had made direct for the _brasserie_ in the Rue de Mesrominil, in accordance with a plan he had thought out. He hid the jewel-case as much as possible under his long servant's coat, and, after having a drink, went down into the yard described and buried the jewels with the aid of a shovel he had previously placed there in readiness. Then, covering the case over, he stamped the ground down solidly, threw some earth and stones on the spot, and returned upstairs. Dessaure, however, as transpired later, had not taken the precaution to ascertain whether anyone was watching him from the windows overlooking the yard. It was obvious to him now that someone must have seen him bury the gems, or else have discovered them subsequently. And now they were for ever lost to him! Covering his face with his hands, the heart-broken man repeated to himself the words, "All for nothing! All for nothing!" Suddenly he pulled himself together, and, walking toward the embankment balustrade, stood there for a moment gazing hesitatingly into the waters of the Seine. Then a hand was placed on his shoulder, and a voice said:-- "Don't do it, Dessaure! Life is all too short in any case." The startled man wheeled round, to behold Detective Brissard at his elbow! Dessaure was about to speak, when the officer anticipated him. "I have watched you ever since your release this morning," he said. "Come, don't be a fool. We will go to my place and have a talk." Dessaure, unnerved by the loss of the jewels, for the sake of which he had served those long years of imprisonment, was as a child in the hands of the shrewd Brissard, and very soon the two men were talking the matter over in Brissard's rooms. Dessaure now told the entire story of how he had stolen the jewels, and the detective in turn informed him that the large reward offered for their recovery was still open, and that, if Dessaure cared to assist him, they might yet obtain possession of them and return them to their owner. The ex-valet, eager to obtain revenge against the unknown who had annexed "his" property, readily agreed. So the curious situation arose of "setting a thief to catch a thief."