"I am only bringing your argument to a logical conclusion, Mallow. If the real Carson has been murdered, Semberry must know of it, else he could have no reason to substitute the false one. Admitting as much, he must either have killed Carson himself, or he must know who did. In either case he is a criminal. Q.E.D." Mallow shook his head. "Even assuming that I am right, Semberry could not have murdered Carson, as it would be sheer folly for him to support an impostor when the real Simon Pure was his friend. However, I don't say that the real Carson has been murdered, nor do I identify him with the Athelstane Place victim; although," added Mallow seriously, "it is a strange thing that the clothes, both of the living and the dead, should smell of sandal-wood." "It is strange," admitted Aldean, "and not to be easily explained. But we have argued the subject threadbare. What is your final opinion?" "My original opinion--Carson is not Carson." "Mallow, you are developing a monomania. Come and unbend your great mind over billiards." The Irishman laughed and agreed. For the next hour or so they were taken up with cannons and breaks, and they left further discussion of Carson's identity to a more fitting occasion. The argument was not renewed that evening, and Mallow retired to bed with his mind less taken up with the subject than usual, and had a good night's rest. However, he woke early the next morning, and his thoughts at once reverted to Olive and her doubtful lover. Beyond the fact of the sandal-wood perfume, he had no reason for connecting the man who had put in an appearance at Casterwell with the victim of Athelstane-Place, and his good sense told him that this was but a slender foundation upon which to build the superstructure of an imposture. And yet there remained with him an instinctive feeling that all was not right. Do what he would, argue as he might, he could not get rid of the idea that Semberry and his friend were brother rogues, bent upon obtaining the dowry of Olive. "I cannot believe in Carson until I find some one who can identify him," thought Mallow, as he dressed himself. "If Mrs. Purcell were only in England, she would settle the question at once. But, according to Miss Slarge, she will not be back for three months, and this man is to marry Olive in two. On the 24th of August she comes of age. By the terms of the will, she must become Mrs. Carson before the 24th of September. After that date, be the man genuine or an impostor, I am powerless."