“I naturally imagined some such question might arise,” the manager said, “and I questioned the clerk who had received the note. At first he was unable to give me even the slightest hint, but on thinking over the matter he said the balance of probability was in favour of its having been paid in by the messenger from Cook’s office in Regent Street. He explained that in Cook’s deposit, which was an unusually heavy one, there were no less than seventeen notes for twenty pounds, and he remarked to the messenger: ‘You’re strong in twenties to-day.’ It was shortly afterwards that the clerk discovered he held one of the numbers sent in by Mr. Tarkington. He had twenty-two twenties in hand when he made his discovery and he believed he had not parted with any since the Cook lodgment, therefore, the chances that the note came from Cook’s are as seventeen to five.” “There is no certainty about that,” said French. “No certainty, but a good sporting chance,” the manager returned with a smile as he bade his visitor good day. The next step was obviously Cook’s office. Here again French asked for the manager, and here again that gentleman shook his head when French stated his business. “I should be only too glad to help you, Mr. French,” he declared, “but I fear it is quite impossible. In the first place we don’t know the numbers of any of the notes which passed through our hands, and we don’t, therefore, know if we had the one in which you are interested. Apparently you don’t even know it yourself. But even if we did know, we couldn’t possibly tell you who paid it in. So much money comes in over the counter that individual notes could not be traced. And then we have no idea of the date upon which we received this one, if we did receive it. You think we lodged it yesterday week. We might have done so and yet have received it weeks before. You see, we keep a fairly large sum in our safe in connection with our foreign exchange department.” “Do you give receipts for all monies received?” “For most transactions. But not all. If a man came in for a ticket to Harrogate, for example, we should hand him the ticket, and the ticket would be his receipt. Again, no note other than that of the actual sums passing is taken in our exchange department.” French smiled ruefully. “It doesn’t seem to get any more hopeful as it goes on, does it?” he remarked, continuing after a moment’s silence. “You see what I’m trying to get at, don’t you? If I could look over your receipts for some time prior to yesterday week I might find a name and address which would suggest a line of inquiry.”