'Of course, it may be that such a man is of so vindictive a nature that he may have taken all this trouble simply to annoy you, but I cannot help thinking that if he had embarked upon it he would have played his hand so as not only to annoy but to extort money to cease that annoyance. Now the writer of these letters has certainly not done that. Had he had any idea of extorting money he would have sent some sort of private intimation to you, by means of a cautiously worded letter, to the effect that an arrangement could be made by which the thing could be put a stop to. You have received no such missive; therefore, if this man is the author he is simply a malicious scoundrel, and not, in this instance at any rate, a clever rogue, as I should certainly have expected to find him from his antecedents.' 'That is to say, you do not think he is the man?' 'Yes, I think it comes almost to that, Mr. Hawtrey. I do not know him, and, of course, he may be the man, but I own that I shall be a good deal surprised if I find that he is so. Still, in the absence of any other clue whatever, I propose to follow this up. It will be something at least to clear it out of the way and to have done with it. I shall detail my boy to watch the public-house till the man comes to it, and then to find out where he lives and what are his habits; to follow his footsteps and take note of every place where he posts a letter. We shall get, at any rate, negative evidence that way. If, for instance, a letter is posted in the south of London, and we know that on that day the man never went out of Islington, I think that it will be very strong proof that he has nothing to do with the matter. Of course the reverse would not be so convincing the other way; but if we had the coincidence, three or four times repeated, of the letter bearing the mark of a district in which he had dropped one into the post, we should feel that we were a long way towards proving his connection with the affair.' 'Quite so,' Mr. Hawtrey agreed; 'that will, as you say, either go far to confirm our suspicions, or will altogether clear the ground so far as he is concerned, and we must then look for a clue in some other direction altogether.'