They all looked at each other, and Mr. Lindsey's gaze finally fastened itself on Andrew Robertson.

"I suppose you don't know anything about this, my friend?" he asked.

"What should I know?" answered Robertson, a bit surlily. "The yacht's just as I found it—not a thing's been touched."

There was the luncheon basket lying on the cabin table—just as I had last seen it, except that Carstairs had evidently finished the provisions which he and I had left. And I think the same thought occurred to Mr. Lindsey and myself at the same moment—how long had he stopped on board that yacht after his cruel abandoning of me? For forty-eight hours had elapsed since that episode, and in forty-eight hours a man may do a great deal in the way of making himself scarce—which now seemed to me to be precisely what Sir Gilbert Carstairs had done, though in what particular fashion, and exactly why, it was beyond either of us to surmise.

"I suppose no one has heard anything of this yacht having been seen drifting about yesterday, or during last night?" asked Mr. Lindsey, putting his question to both men. "No talk of it hereabouts?"

But neither the police nor Andrew Robertson had heard a murmur of that nature, and there was evidently nothing to be got out of them more than we had already got. Nor had the police heard of any stranger being seen about there—though, as the man who was with us observed, there was no great likelihood of anybody noticing a stranger, for Largo was nowadays a somewhat popular seaside resort, and down there on the beach there were many strangers, it being summer, and holiday time, so that a strange man more or less would pass unobserved.

"Supposing a man landed about the coast, here," asked Mr. Lindsey—"I'm just putting a case to you—and didn't go into the town, but walked along the beach—where would he strike a railway station, now?"

The police official replied that there were railway stations to the right and left of the bay—a man could easily make Edinburgh in one direction, and St. Andrews in the other; and then, not unnaturally, he was wanting to know if Mr. Lindsey was suggesting that Sir Gilbert Carstairs had sailed his yacht ashore, left it, and that it had drifted out to sea again?

"I'm not suggesting anything," answered Mr. Lindsey. "I'm only speculating on possibilities. And that's about as idle work as standing here talking. What will be practical will be to arrange about this yacht being locked up in some boat-house, and we'd best see to that at once."

We made arrangements with the owner of a boat-house to pull the yacht in there, and to keep her under lock and key, and, after settling matters with the police to have an eye on her, and see that her contents were untouched until further instructions reached them from Berwick, we went off to continue our journey. But we had stayed so long in Largo that when we got to Edinburgh the last train for Berwick had gone, and we were obliged to turn into an hotel for the night. Naturally, all our talk was of what had just transpired—the events of the last two days, said Mr. Lindsey, only made these mysteries deeper than they were before, and why Sir Gilbert Carstairs should have abandoned his yacht, as he doubtless had, was a still further addition to the growing problem.