What could it mean?--what could it all be? Even this opening, in the hitherto-supposed-to-be impregnable walls--was it a new opening, or did it exist always? Mary stood wondering, listening, looking; or, rather, peering: peering into the darkness of the night, for it was not light enough to look. These vaults, how much farther did they extend? She could not conjecture, and dared not attempt to discover, lest she lost her way back again: all the interstices of these pillared cloisters seemed one so like another that she might not risk it. Turning away from the fresh breeze and the welcome smell of the sea, she began to retrace her steps. To retrace her steps, as she imagined, her thoughts very full. The question had been mooted, by people unacquainted with the place--were there any means by which the unfortunate Anthony Castlemaine could be effectually disposed of, if the worst had happened to him: say, any facility for throwing him into the sea? The answer had always been No, not from the Friar's Keep, for the Keep had no communication of any kind with the sea, its walls were thick and impervious. But, it seemed that there was a communication with the sea--as Mary had now just seen. Her thoughts and her breath alike came unpleasantly quick, and she groped along, and laid her disengaged hand on her bosom to still its pain. But where was the door? Where? She thought she had been going in its direction, but she had come far enough, and to spare, and here was no sign of it. Was she indeed lost in this ghostly place? Her heart beat ten times more wildly at the thought. She was very cautious in the use of the lantern, lest it might betray her, should anyone chance to be there: carrying it close before her, and keeping three of its sides dark. She moved it here, she moved it there: but no trace of the door did it shine upon; and in her desperation, she pushed down the three dark slides, and flung the light aloft. Nothing was to be seen but the dark stone floor of the vaults, their intersected pillars and arches above, and the openings between them. One spot, one division, was ever just like another. Lost! lost! Her hand fell with the lantern: the drops of fear broke out on her face. At that moment a sound, as of the banging of a door, echoed among the pillars, and she hastily hid the glaring lantern under her shawl. Other sounds came. Some door had evidently been shut, for now it was being barred and bolted. It was not very near, and Mary Ursula waited. Then, turning on the full light of her lantern again, and keeping her back to the sounds, she went swiftly, blindly about, in search of the passage door. Ah, what a blessing! There it was, now, before her. Perhaps in all her life she had never experienced a moment of relief like that. A sound of joy faintly escaped her; an aspiration of thankfulness went up from her heart.