to Fowlis. Nothing came of it all. A message awaited us from Lord Craig-Ellachie, to be sure, saying that his son had not left Glen-Ellachie Lodge; while research the next day and later showed that our correspondent had never even received our letter. An empty envelope alone had arrived at the house, and the postal authorities had been engaged meanwhile, with their usual lightning speed, in "investigating the matter." Césarine had posted the letter herself at Fowlis, and brought back the receipt; so the only conclusion we could draw was this--Colonel Clay must be in league with somebody at the post-office. As for Lord Craig-Ellachie's reply, that was a simple forgery; though, oddly enough, it was written on Glen-Ellachie paper. However, by the time Charles had eaten a couple of grouse, and drunk a bottle of his excellent Rudesheimer, his spirits and valour revived exceedingly. Doubtless he inherits from his Boer ancestry a tendency towards courage of the Batavian description. He was in capital feather. "After all, Sey," he said, leaning back in his chair, "this time we score one. He has _not_ done us brown; we have at least detected him. To detect him in time is half-way to catching him. Only the remoteness of our position at Seldon Castle saved him from capture. Next set-to, I feel sure, we will not merely spot him, we will also nab him. I only wish he would try on such a rig in London." But the oddest part of it all was this, that from the moment those two people landed at Niggarey, and told the fishermen there were some gentlemen stranded on the Seamew's island, all trace of them vanished. At no station along the line could we gain any news of them. Their maid had left the inn the same morning with their luggage, and we tracked her to Inverness; but there the trail stopped short, no spoor lay farther. It was a most singular and insoluble mystery. Charles lived in hopes of catching his man in London. But for my part, I felt there was a show of reason in one last taunt which the rascal flung back at us as the boat receded: "Sir Charles Vandrift, we are a pair of rogues. The law protects _you_. It persecutes _me_. That's all the difference." VI THE EPISODE OF THE GERMAN PROFESSOR