"Well Mr. Setter, it is useless to regret that mistake now. Be so good as to call a cab. We will go at once to Westminster Road and see this Mrs. Brown. What information has she given you?" "None whatever, except this, which we knew before--that she visited the bride on the afternoon of the wedding day. She declines to tell _me_ the nature of her business with the duchess; but says that she will explain it to you; she further denies all knowledge of the present abode of the duchess." "Then we must lose no time in going to the woman," said the duke. As he spoke, the cab which had been signalled by the detective drove up, and the cabman jumped down and opened the door. The duke entered it and sat down on the back cushions. His grace's servant, Kerr, came up to the window for orders. "Take my luggage home to Elmthorpe House. Give my respects to Lady Belgrade, and say that I will join her ladyship this afternoon," said the duke. The servant touched his hat and withdrew. "To Number ----, Westminster Road," ordered Mr. Setter, as he mounted to the box-seat beside the cabman. The latter started his horses at a good rate of speed, so that a drive of about forty minutes brought them to their destination. The detective jumped down and opened the door, saying, "Excuse me, your grace; but, I think, perhaps I ought to go in first to ensure you an interview with the woman?" "By all means go in first, officer. I will remain here in the cab until you return to summon me," answered the duke. Detective Setter went up to the door and knocked, and then waited a few seconds until the door was opened, and he was admitted by an unseen hand. A few minutes elapsed, and then detective Setter reappeared, and came up to the cab and said: "She will see you at once, early as it is, your grace, I do not know what in the world possesses the old woman; but she is chuckling in the most insane manner in the anticipation of meeting you 'face to face,' as she calls it." "Well, we shall soon see," said the duke, as, with a resigned air, he followed Mr. Setter into the house. The detective led him up stairs to the gaudy parlor which had once been Rose Cameron's sitting-room. There was no one present; but the detective handed a chair to the duke, and begged him to sit down and wait for Mrs. Brown's appearance. The duke threw himself into the chair, and gazed around him upon the garish scene, until a chamber door opened, and Mrs. Brown, in her Sunday's best suit, sailed in. The duke arose. Mrs. Brown came on toward him, courtesying stiffly, and saying: "Good morning to you, Mr. Scott! It is a many months since I have had the pleasure of seeing you in this house." The duke was not so much amazed at this greeting as he might have been, had he not heard the astounding testimony of Rose Cameron. So he answered quietly: