so unique, that the detective who discovers it should be able to convict me. A crime committed to decide a wager is perhaps new."
"Its very novelty is your best safeguard."
"Yet there are two ways by which it may be discovered, and that is two too many. Had I undertaken this affair secretly there would really have been but a single way for one to learn my secret—my own confession. As men have been weak enough to do this before now, I should even in that instance have taken precautions. But with my secret in the possession of a second party, the position is more complex."
"I assure you on my honor that I will not betray you. I will agree to forfeit five times the wager in such an event."
"I prefer that you should be perfectly at liberty in the matter. I expect it to be thus: in your own mind at present you do not think that I shall carry out my purpose. Therefore, your friendship for me is undisturbed. Then you count that, if I do commit a crime, it will be some trivial one that you may bring your conscience to excuse, under the circumstances. But let us suppose that a really great crime should be reported, and for some reason you should suspect me. You will hurry to my rooms before I get out of bed, and ask me flatly whether I am guilty. As flatly I should refuse to enlighten you. You would take this as a confession of guilt. You would perhaps argue that if your surmise were correct you would be an accessory before the fact, and to shield yourself and do your duty you would make a clean breast of it."
"I am beginning to be offended, Bob. I did not think you would trust me so little!"
"Don't get angry, old man. Remember that only a few minutes ago you warned me that you would cut me dead after the crime. We artistic criminals must be prepared against every contingency."
"I did not think when I spoke. I did not mean it."
"Yes, you did, and I am not at all angry. Let it be understood then that you will be at liberty to repeat the facts about this wager should your conscience prick you. It will be best for me to expect and be prepared for such action. But you have not asked what the second danger of discovery is. Can you guess?"
"Not unless you mean as you suggested, your own confession."
"No, though that really makes a third chance. Yet it is so simple. Have you noticed that we can hear a man snoring?"
"No!"
"Listen a moment! Do you not hear that? It is not exactly a snore, but rather a troubled breathing. Now that man is in the third section from us. Do you see the point?"
"I must confess that I would not make a detective."
"Why, my dear boy, if we can hear that fellow, why may not some one in the next compartment be listening to our tête-à-tête?" Mr. Barnes fairly glowed with admiration for the fellow's careful consideration of every point.
"Oh, I guess not. Everybody is asleep."
"The common criminal from necessity takes chances like that, without counting on them. I shall not. There is a possibility, however remote, that some one, in Number Ten say, has overheard us. Again he may even be a detective, and worse yet it might be your Mr. Barnes himself."
"Well, I must say if you prepare against such long odds as that you deserve to escape detection!"
"That is just what I will do. But the odds are not so great as you imagine. I read in an afternoon paper that Mr. Barnes had remained in Boston in connection with properly securing his prisoner during the day, but that he would leave for New York to-night. Of course the newspaper may have been wrong. Then in saying "to-night" it may have been inaccurate; but supposing that the statement were true, then there were three trains upon which he might have started, one at seven o'clock, one at eleven, and this one. One in three is not long odds."
"But even if he is on this train, there are ten coaches."
"Again you are wrong. After his hard work on this Pettingill case he would be sure to take a sleeper. Now if you recall the fact, I did not decide to go to New York to-night till the last minute. Then we found that we could not get a whole section, and were about to bunk together in a lower berth when, several more people applying, they determined to put on another coach. Therefore, unless Mr. Barnes secured his ticket during the day, he would inevitably have been assigned to this coach."
"Had you any special reason for suggesting Number Ten?"
"Yes. I know that Number Six is unoccupied. But just as we started some one came in, and I think took the upper berth of Number Ten."
"Mr. Barnes began to think that he would have exceedingly difficult work to detect this man in crime, were he really to commit one, in spite of the fact that he knew so much in advance. The conversation continued:
"Thus, you see, there are two ways by which my object may become known, a serious matter if unguarded against. As, however, I recognize the possibilities in advance, there will be no difficulty whatever, and the knowledge will be of no value to any detective, even though he be your Mr. Barnes."
"How will you avoid that danger?"
"My dear boy, do you suppose for an instant that I would reply to that, after pointing out that a detective may be listening? However, I will give you an idea. I will show you what I meant when I said that Pettingill had blundered. You said that he had lost only a button, and thought it clever in Barnes to trace him from the button. But a button may be a most important thing. If I should lose one of the buttons of my vest, whilst committing a crime, Mr. Barnes would trace me out in much less than ten days, and for this reason, they are the only ones of the kind in the world."
"How does that happen? I supposed that buttons were made by the thousand?"
"Not all buttons. For reasons which I need not tell the possibly listening detective, a friend travelling abroad had a set made especially, and brought them back to me as a present. They are six handsomely cut cameos, half the set having the profile head of Juliet, and the others a similar face of Romeo."
"A romance?"
"That is immaterial. Suppose that I should plan a robbery in order to decide this wager. As necessity would not urge me either as to time or place, I should choose my opportunity, let us say when but one person guarded the treasure. That one I should chloroform and also tie. Next, I should help myself to the designated plunder. Suppose that as I were about to depart a sleeping, uncalculated-for pet dog should jump out and bark furiously? I reach for it and it snaps at me, biting my hand. I grapple it by the throat and strangle it, but in its death throes it bites my vest, and a button falls to the ground and rolls away. The dog is at last silenced. Your ordinary burglar by this time would be so unnerved that he would hasten off, not even realizing that he had been bitten, that blood had flowed, or that the button was lost. Mr. Barnes is sent to the house the next day. The lady suspects her coachman, and Mr. Barnes consents to his arrest, not because he thinks him guilty, but because, as the mistress thinks so, he may be, and then more especially, his arrest will lull the fear of the real culprit. Mr. Barnes would observe blood on the ground, on the dog's mouth, and he would find the button. From the button he would find Mr. Thief, with his hand bitten, and there you are."
"But how should you avoid all that?"
"In the first place, were I really wise, I should not have tell-tale buttons about me at such a time. But let us suppose that the time had not been of my own choosing, then the buttons might have been with me. Assured as I should have been that the only person in the house lay chloroformed and tied, I should not have lost my nerve as did the other individual. Neither should I have allowed myself to be bitten, though if the accident had occurred I should have stopped to wash up the stain from the carpet while fresh, and also from the dog's mouth. I should have discovered the loss of the button, searched for and recovered it, untied the victim, and opened the windows, that the odor of chloroform could pass off during the night. In fact, in the morning the only evidence of crime would have been the strangled dog and the absence of the pelf."
"It is easy enough to explain your actions under suppostitious circumstances. But I doubt if in Pettingill's shoes you would have been able to