Though very calm in the main and invariably master of himself, Lupin, nevertheless, was subject to moments of exaltation, of a more or less romantic expansiveness, at once theatrical and good-humored, when he allowed certain admissions to escape him, certain imprudent speeches which a boy like Beautrelet could easily turn to profit. Rightly or wrongly, Beautrelet read one of these involuntary admissions into that phrase. He was entitled to conclude that, if Lupin drew a comparison between his own efforts and Beautrelet’s in pursuit of the truth about the Hollow Needle, it was because the two of them possessed identical means of attaining their object, because Lupin had no elements of success different from those possessed by his adversary. The chances were alike. Now, with the same chances, the same elements of success, the same means, ten days had been enough for Lupin. What were those elements, those means, those chances? They were reduced, when all was said, to a knowledge of the pamphlet published in 1815, a pamphlet which Lupin, no doubt, like Massiban, had found by accident and thanks to which he had succeeded in discovering the indispensable document in Marie Antoinette’s book of hours. Therefore, the pamphlet and the document were the only two fundamental facts upon which Lupin had relied. With these he had built up the whole edifice. He had had no extraneous aid. The study of the pamphlet and the study of the document—full stop—that was all. Well, could not Beautrelet confine himself to the same ground? What was the use of an impossible struggle? What was the use of those vain investigations, in which, even supposing that he avoided the pitfalls that were multiplied under his feet, he was sure, in the end, to achieve the poorest of results? His decision was clear and immediate; and, in adopting it, he had the happy instinct that he was on the right path. He began by leaving his Janson-de-Sailly schoolfellow, without indulging in useless recriminations, and, taking his portmanteau with him, went and installed himself, after much hunting about, in a small hotel situated in the very heart of Paris. This hotel he did not leave for days. At most, he took his meals at the _table d’hôte_. The rest of the time, locked in his room, with the window-curtains close-drawn, he spent in thinking. “Ten days,” Arsène Lupin had said.