We could not see very well what became of them, after this, for the big rock hid them from our view; but as it was evident they could not get back again—at least by the same means they had employed to reach the islet,—Nux and I made bold to creep out of our shelter and approach the point that jutted outward into the sea.
Then, to our surprise, we saw that the flat top of the rock was deserted. The robbers, together with Bry and the treasure, seemed to have vanished into thin air!
CHAPTER XI
THE CAVERN.
From our better position we could now see the sides of the great rock which reared itself nearly a hundred feet from the shore and stood like some gigantic, flat topped obelisk, keeping guard by the lonely sea. Some ancient convulsion of nature, such an earthquake or a lightning bolt, had evidently split it from the main precipice of rock near which it stood; for the huge crevice that separated it, and which extended entirely down to the beach, almost followed its outlines in every particular. But what had cast up that great rocking-stone, and placed it in so finely balanced a position that it could be made a curious but effective bridge to the isolated peak? No one can tell. Another freak of nature, doubtless, for no mortal hands could ever have moved so great a weight of solid rock.
And now was solved the problem of the mysterious disappearance of the robbers; for, looking over the edge, we saw them creeping slowly down the side of the cliff. A natural ledge, varying from one to three feet in breadth, led from the top down to the bottom, circling entirely around the crag with a sort of corkscrew regularity. It was a dizzy path, most certainly, and I did not wonder to see the men cling fast to the inner side of the rock as they crept down the tortuous ledge; but Daggett, who evidently knew the place well, led them fearlessly, and the others followed, dragging their burdens and the sacks of gold dust as best they could. I certainly expected to see one or more of them tumble headlong at any moment; but no accident happened and presently, as they descended, the path wound around the opposite side of the rock, and they were lost to view.
I wondered if I would see them again, and if it were wise to stick to my exposed post of observation; but while I pondered the matter Daggett came into view again, having passed around the rock. He was now two thirds of the way to the sands, and as he followed the ledge on the inner side, that lay next the face of the main cliff, I saw him suddenly pause upon a broader part of the path than the rest, and then disappear into the rock itself—or so it seemed to my gaze from where I watched. One by one the men came after him, and one by one the rock swallowed them up with their burdens; and now passed a period of tedious waiting.
Both Nux and I had counted the fugitives and saw that all had safely descended to this point, including Bry. But what had become of them now was a mystery.
“What shall we do, Nux?” I asked in indecision. “There’s nothing more to be seen from here.”
The black, whose eyes held a startled expression, made no reply; but he crept with me to a nearer and better position at the edge of the cliff beside the rocking-stone, and together we peered over into the abyss. Now, indeed, the strange disappearance of the robbers was explained, for from our present point or vantage we could see a black spot far down on the inner face of the column of rock, where the ledge passed, and this spot was evidently a cavity into which the men had penetrated.