There, not more than a couple of feet away, was a small opening, less than eighteen inches wide by about a yard in height. Hidden by the overhanging end of the hedge, it would be invisible from below. Here was the road Julia had taken. Juliet did not hesitate. She could reach the aperture easily, and it would have been the simplest thing in the world to climb into it, but for the yawning chasm beneath. Holding firmly to the friendly holly, and resisting, with an effort, the temptation to look down, she swung herself bravely over the edge and scrambled into the hole with a gasp of relief. It was, after all, not very difficult. She found herself standing within the entrance of a narrow passage built into the thickness of the wall. Beside the opening through which she had come, a little door of oak, grey with age and strengthened with rusty bars and cross-pieces of iron, drooped upon its one remaining hinge. Two huge slabs of stone leaning near it, against the wall, showed how it had been the custom in former centuries to fortify the entrance still more effectively in time of danger. Juliet did not wait to examine these fragments, interesting though they might be to archaeologists, but hurried down the passage as quickly as she could in the darkness that filled it, feeling her way with an outstretched hand upon the stones on either side. As her eyes became accustomed to the obscurity, she saw that though the way was dark it was yet not entirely so: a gloomy light penetrated at intervals through ivy-covered loopholes pierced in the thickness of the outer wall; and she imagined bygone McConachans pouring boiling oil or other hospitable greeting through those slits on to the heads of their neighbours. But surely, she reflected, no one would ever have attacked the castle from that side, where the precipice already offered an impregnable defence; the passage must have been used as a means of communication with the outer world, or, perhaps, as a last resort, for the purpose of escape by the beleaguered forces. After fifty yards or so of comparatively easy progress, the shafts of twilight from the loopholes ceased to permeate the murky darkness in which she walked, and she was obliged to go more slowly, and to feel her way dubiously by the touch of hands and feet. The floor appeared to her to be sloping away beneath her, and as she advanced the descent became more and more rapid, till she could hardly keep her feet. She went very gingerly, with a vague fear lest the path should stop unexpectedly, and she herself step into space.