I am to dine with him this evening, and I shall cordially recommend you. I may say that Briggs has gone to that celebrated London detective Mr. Cadbury Taylor, and has engaged him to solve the diamond mystery. So you see you will have a clear field. If you can leave for the castle to-morrow night, you may have the pleasure of Mr. Cadbury Taylor's company. He isn't visiting the castle, but goes straight to Vienna; so if you work your cards rightly, you can be in the same carriage with him as far as Munich, and during that time you may find out perhaps what he thinks about the case. I know only this much about his theory, and that is he thinks the right place to begin is in Vienna, where some, at least, of the stones are supposed to have been pawned."