"I do not care for the Louis XV chatelaine, as I doubt its

       authenticity."

      That letter completely upset the baron. Had it borne any other signature, he would have been greatly alarmed—but signed by Arsène Lupin!

      As an habitual reader of the newspapers, he was versed in the history of recent crimes, and was therefore well acquainted with the exploits of the mysterious burglar. Of course, he knew that Lupin had been arrested in America by his enemy Ganimard and was at present incarcerated in the Prison de la Santé. But he knew also that any miracle might be expected from Arsène Lupin. Moreover, that exact knowledge of the castle, the location of the pictures and furniture, gave the affair an alarming aspect. How could he have acquired that information concerning things that no one had ever seen?

      The baron raised his eyes and contemplated the stern outlines of the castle, its steep rocky pedestal, the depth of the surrounding water, and shrugged his shoulders. Certainly, there was no danger. No one in the world could force an entrance to the sanctuary that contained his priceless treasures.

      No one, perhaps, but Arsène Lupin! For him, gates, walls and drawbridges did not exist. What use were the most formidable obstacles or the most careful precautions, if Arsène Lupin had decided to effect an entrance?

      That evening, he wrote to the Procurer of the Republique at Rouen. He enclosed the threatening letter and solicited aid and protection.

      The reply came at once to the effect that Arsène Lupin was in custody in the Prison de la Santé, under close surveillance, with no opportunity to write such a letter, which was, no doubt, the work of some imposter. But, as an act of precaution, the Procurer had submitted the letter to an expert in handwriting, who declared that, in spite of certain resemblances, the writing was not that of the prisoner.

      But the words "in spite of certain resemblances" caught the attention of the baron; in them, he read the possibility of a doubt which appeared to him quite sufficient to warrant the intervention of the law. His fears increased. He read Lupin's letter over and over again. "I shall be obliged to remove them myself." And then there was the fixed date: the night of 27 September.

      To confide in his servants was a proceeding repugnant to his nature; but now, for the first time in many years, he experienced the necessity of seeking counsel with some one. Abandoned by the legal official of his own district, and feeling unable to defend himself with his own resources, he was on the point of going to Paris to engage the services of a detective.

      Two days passed; on the third day, he was filled with hope and joy as he read the following item in the `Reveil de Caudebec', a newspaper published in a neighboring town:

      "We have the pleasure of entertaining in our city, at the present time, the veteran detective Mon. Ganimard who acquired a world-wide reputation by his clever capture of Arsène Lupin. He has come here for rest and recreation, and, being an enthusiastic fisherman, he threatens to capture all the fish in our river."

      Ganimard! Ah, here is the assistance desired by Baron Cahorn! Who could baffle the schemes of Arsène Lupin better than Ganimard, the patient and astute detective? He was the man for the place.

      The baron did not hesitate. The town of Caudebec was only six kilometers from the castle, a short distance to a man whose step was accelerated by the hope of safety.

      After several fruitless attempts to ascertain the detective's address, the baron visited the office of the `Reveil,' situated on the quai. There he found the writer of the article who, approaching the window, exclaimed:

      "Ganimard? Why, you are sure to see him somewhere on the quai with his fishing-pole. I met him there and chanced to read his name engraved on his rod. Ah, there he is now, under the trees."

      "That little man, wearing a straw hat?"

      "Exactly. He is a gruff fellow, with little to say."

      Five minutes later, the baron approached the celebrated Ganimard, introduced himself, and sought to commence a conversation, but that was a failure. Then he broached the real object of his interview, and briefly stated his case. The other listened, motionless, with his attention riveted on his fishing-rod. When the baron had finished his story, the fisherman turned, with an air of profound pity, and said:

      "Monsieur, it is not customary for thieves to warn people they are about to rob. Arsène Lupin, especially, would not commit such a folly."

      "But—-"

      "Monsieur, if I had the least doubt, believe me, the pleasure of again capturing Arsène Lupin would place me at your disposal. But, unfortunately, that young man is already under lock and key."

      "He may have escaped."

      "No one ever escaped from the Santé."

      "But, he—-"

      "He, no more than any other."

      "Yet—-"

      "Well, if he escapes, so much the better. I will catch him again. Meanwhile, you go home and sleep soundly. That will do for the present. You frighten the fish."

      The conversation was ended. The baron returned to the castle, reassured to some extent by Ganimard's indifference. He examined the bolts, watched the servants, and, during the next forty-eight hours, he became almost persuaded that his fears were groundless. Certainly, as Ganimard had said, thieves do not warn people they are about to rob.

      The fateful day was close at hand. It was now the twenty-sixth of September and nothing had happened. But at three o'clock the bell rang. A boy brought this telegram:

      "No goods at Batignolles station. Prepare everything for tomorrow night. Arsène."

      This telegram threw the baron into such a state of excitement that he even considered the advisability of yielding to Lupin's demands.

      However, he hastened to Caudebec. Ganimard was fishing at the same place, seated on a campstool. Without a word, he handed him the telegram.

      "Well, what of