'There is another of them,' Mr. Hawtrey said, throwing the letter down before him. 'I got it at the central office.' It was in the same handwriting as that on the previous day: 'Unless you agree to my terms your letters will be sent to Lord H----.' 'The post-office people have discovered that this letter was posted at a receiving office at Claymore Street, Chelsea.' 'That would be valuable, Mr. Hawtrey, if there were any probability of the next being posted at the same place. I could make an arrangement to have a boy placed inside by the box so that he could see each letter as it fell in. Then he would only have to run out and follow whoever had posted it. I should probably require some special order from the Postmaster-General for this, but I dare say I could get that. At any rate, we can wait a day or two. If the next letter is posted there we will try that plan; if it is posted elsewhere it will, of course, be useless.' Mr. Hawtrey next drove to Lord Halliburn's, in Park Lane. 'I have come on very unpleasant business, Halliburn,' he said. 'Dorothy would have told you herself about it yesterday, but I thought it better to let it stand over for a day, especially as she would not have an opportunity of discussing it with you,' and he then laid the two letters before him, and told him the steps he had taken and the conjectures that he and Danvers had formed on the subject of the sender. Lord Halliburn was a young man of about nine-and-twenty. He somewhat prided himself on his self-possession, and, although generally liked, was regarded, as Danvers had told his friend, as somewhat of a prig. His face expressed some annoyance as he heard the story. 'It is certainly unpleasant,' he said. 'I am, of course, perfectly sure that Dorothy is in no way to blame in the matter. This can be only a malicious attempt to annoy her. Still, I admit it is annoying. Things of this sort are sure to get about somehow. I am certain that everyone who knows Dorothy will see the matter in the same light as we do, but those who do not will conclude that there is something in it. Probably enough ere long there will be a mysterious paragraph in one of those society papers. Altogether it is certainly extremely annoying. The great thing is to find out who sent them. I quite agree with you it cannot be an attempt to extort money; had it been so, the demands would have been sent under seal and not in this manner. I suppose you have no idea of anyone having any special enmity against either you or her?' 'Not the slightest. The man who, as I told you, Danvers consulted without mentioning any names, was of opinion that it might be the work of some woman, and was intended to cause unpleasantness between you and Dorothy. Of course, in that case you might be more able to form an idea as to the writer than I can be.'