"Well, I don't mind telling you that, though perhaps I am showing my hand a little. Let us go to the beginning. In the first place you knew about my bet, and I knew that you knew that much. From that starting-point what more natural than for me to suppose that you would begin by having me shadowed. To be sure of this, I made a few trips on the elevated road, a structure peculiarly applicable for such a test, with the result of course that I soon became pretty well acquainted with your assistant. Whenever I had nothing else to do, I would amuse myself getting away from him. You gave me occupation for several hours I assure you. But to come to Lucette. I guessed that the next step in your game would be to supply spy number two, who would take up the trail wherever spy number one would lose it. I began to look for this second man. See, I admit that I did not count upon a woman. You beat me there, or almost did. I don't suppose you told the girl to let me see her face, eh?" Mr. Barnes made no reply, though to himself he said, "Just as I told the fool." Mr. Mitchel went on: "At last one day, just as I was getting on a train, a smart-looking young woman came out of the waiting-room and followed me aboard. Purely from habit I walked through the train to the first coach. I ride in that because it is the coolest in summer and the least draughty in winter. Now there were several cross seats empty in the coaches through which I passed, and as the young woman behind me did not take one, but followed me through the train, I became suspicious. When she sat down opposite to me, of course I studied her face. I hardly ever forget a face after I have made a mental note of it. The rest was simple. She was sharp enough not to get off the train when I did, and I dismissed her from my mind. Thus I suppose she was enabled to follow me to the Irving Place house. But of course I recognized her at once when I saw her at Miss Remsen's." "Did I understand you to say that this Rose Mitchel is your daughter?" "I don't know what you understood, but I did not say so. I spoke of her just as you did, 'Rose Mitchel, who passed as my daughter.'" "Well, then, is she your daughter?" "I decline to answer." "Why do you do so?" "I must decline to reply to that also." "Do you not see, Mr. Mitchel, you are simply making your actions more and more suspicious?" "My dear Mr. Barnes, I do not care a straw how much suspicion I arouse, so long as I am not confronted by any proof. Whenever you think you have any proof against me, come to me and I will endeavor to refute it." "Very well. You have asked me to discover who stole Miss Remsen's ruby. I have already done so." "Mr. Barnes, you are a genius. Who is it?" "Yourself." "Bosh! Can't you do better than that? Why, I have been sick abed here for over three days."