'We quite see that. Still, it will be something to find him; then we can have him watched, and, if possible, caught in the act of posting the letters.' 'You will find that difficult--I do not mean the watching him nor seeing him post his letters, but bringing it home to him. I would rather have to deal with anything than with a matter where you have got the Post Office people to get round. Once a letter is in a box it is their property until it is handed over to the person it is directed to. Still, we may get over that, somehow. The first thing, I take it, is to find the man. You say his betting name is Marvel?' 'That is the name he had on his hat at Epsom on the Oaks day, but he may have a dozen others.' 'Ah, that is true enough. Still, no doubt he has used it often enough for others to know him by it; and now for his description. 'Thank you, that will be sufficient. I think I will send a man down to Windsor at once; the races are on again to-day. He will get his address out of one or other of his pals. It will cost a five-pound note at the outside. If you will give me your address, I shall most likely be able to let you have it this evening.' 'I wish to goodness I had come to you before,' Captain Hampton said. 'Here I have been wasting three weeks trying to find the man, and spending fifty or sixty pounds in railway fares, stand tickets and expenses, and you are able to undertake it at once.' 'It is a very simple matter, Captain Hampton. I have been engaged in two or three turf cases, and one of my men knows a lot of the hangers-on at racecourses. Watches and other valuables are constantly stolen there, and as often enough these things are gifts, and are valued beyond their mere cost in money, their owners come to us to try if we can get them back for them, which we are able to do three times out of four. Whoever may steal the things, they are likely to get into one of four or five hands, and as soon as we let it be known that we are ready to pay a fair price for their return and no questions asked, it is not long before they are brought here. I don't say I may be able to find out this man's exact address, but I can find out the public-house or other place where he is generally to be met with. I don't suppose the actual address of one in ten of these fellows is known to others. They are to be heard of in certain public-houses, but even their closest pals often don't know where they live. Sometimes, no doubt, it is in some miserable den where they would be ashamed to meet anyone. Sometimes there may be a wife and family in the case, and they don't want men coming there. Sometimes it may be just another way. Many of these fellows at home are quiet, respectable sort of chaps, living at some little place where none of their neighbours, and perhaps not even their wives, know that they have anything to do with racing, but take them for clerks or warehousemen, or something in the city. So I don't promise to find out the fellow's home,