was leaving the building, a free man, he was seized by two guards and placed in the prison-van. Since then he had occupied cell 24. He was contented there, plenty to eat, and he slept well—so he did not complain. All that seemed probable; and, amidst the mirth and excitement of the spectators, the judge adjourned the trial until the story could be investigated and verified. The following facts were at once established by an examination of the prison records: Eight weeks before a man named Baudru Désiré had slept at the Dépôt. He was released the next day, and left the Dépôt at two o’clock in the afternoon. On the same day at two o’clock, having been examined for the last time, Arsène Lupin left the Dépôt in a prison-van. Had the guards made a mistake? Had they been deceived by the resemblance and carelessly substituted this man for their prisoner? Another question suggested itself: Had the substitution been arranged in advance? In that event Baudru must have been an accomplice and must have caused his own arrest for the express purpose of taking Lupin’s place. But then, by what miracle had such a plan, based on a series of improbable chances, been carried to success? Baudru Désiré was turned over to the anthropological service; they had never seen anything like him. However, they easily traced his past history. He was known at Courbevois, at Asnières and at Levallois. He lived on alms and slept in one of those rag-picker’s huts near the barrier de Ternes. He had disappeared from there a year ago. Had he been enticed away by Arsène Lupin? There was no evidence to that effect. And even if that was so, it did not explain the flight of the prisoner. That still remained a mystery. Amongst twenty theories which sought to explain it, not one was satisfactory. Of the escape itself, there was no doubt; an escape that was incomprehensible, sensational, in which the public, as well as the officers of the law, could detect a carefully prepared plan, a combination of circumstances marvelously dove-tailed, whereof the dénouement fully justified the confident prediction of Arsène Lupin: “I shall not be present at my trial.” After a month of patient investigation, the problem remained unsolved. The poor devil of a Baudru could not be kept in prison indefinitely, and to place him on trial would be ridiculous. There was no charge against him. Consequently, he was released; but the chief of the Sûrété resolved to keep him under surveillance. This idea