It required considerable care to climb the rocks, and more than once they hurt their feet on sharp projections. The top of the rock, however, was smooth by the action of time and sea, and they were able to sit down on it in comfort.

"The castle is just as you described it, Bertie; and certainly no one sailing past, however close he came outside these rocks, would be able to detect it. No doubt the stone of which it is built is the same as that of the cliffs. Most likely it was taken from the ravine where the passage now is, and had fallen from the arch above. It might have been more noticeable at first, but now it is weathered into exactly the same tint as the cliffs. The openings are very dodgily placed, and a stranger would not dream that they went many inches in. Now, from where we stand we can look up into that curious opening on the top story. I have been puzzling over that ever since I saw it, but can't think of any possible reason for its having been cut like that, except to enable them to throw stones on to any boat that came into this passage behind the rocks; and yet that can hardly have been the case, for, as I remarked, there are no stones piled up there. Certainly they had a very large number of arrows, but stones would be very much more useful than arrows against a boat almost under their feet. However, that does not concern us now. This line of rocks must greatly aid in hiding the house from the sea. They are higher than you thought they were, looking down at them from above. We are quite thirty feet above the water, and at two or three points they are at least ten or twelve feet higher. Of course a short way out no one would be able to see that they were detached from the cliff, or that there was any passage whatever behind them.