But our peace in a physical sense was very abruptly broken when we quitted Kirkwall en route for the Holy Grail of our pilgrimage, Noltland Castle, which secludes itself on the far-off island of Westray, and, leaving the quiet of Scapa Flow behind us, encountered once more the tumults of the Pentland Firth. But these were nothing in comparison with those that met us as soon as we had rounded the southwest corner of Hoy. The hills of Hoy, so far as we had yet seen them, were of no very great magnitude; but now, as we went northward, they showed themselves as a line of tremendous precipices, which rose from the booming waves to an altitude of twelve hundred feet. This monstrous wall ended where a narrow and mysterious fiord separates Hoy from a low-hilled island north of it. This island gave place to another, and at last, late in the day, our captain told us that we were passing the outer shore of Westray. Consulting our maps, and pointing to the mouth of some new fiord, we asked him if it would not afford us a short cut to our destination. He told us that it was full of hidden rocks and sandbanks, and called our attention to some enigmatic object which rose in midchannel like a deer's horns from the sea. "There," he said, "are the masts of an Icelandic steamer which attempted two years ago to make that passage, and was lost. To reach Westray in safety we must double its farthest promontory." An hour or two later this feat was accomplished. We were once more in smooth water, and found ourselves quietly floating toward something like a dwarf pier and one or two small white houses. By now it was time for dinner, and having dined in a saloon that was hung with jade-green silk, we leaned over the bulwarks and contemplated the remote scene before us. We could just discern by the pier some small tramp steamer reposing. In the little white houses one or two lights twinkled, and presently, not far off, we distinguished a mouse-colored something, the upper outlines of which resolved themselves into high gables. Like Childe Roland when he came to the dark tower, we realized that these were the gables of Noltland Castle. Next morning we explored this building. The main block consisted of a tower unusually large, in the middle of which was a great red-sandstone staircase winding round a newel which culminated in a heraldic monster. This staircase led to a great hall, roofless, but otherwise perfect. Above it had once been bedrooms. On the ground floor were vaulted offices, including a hearth as large as the kitchen of a well-built cottage. Attached to the tower was a court. Ruined chambers surrounded it, in which guests, their retinues, and the servants of the house once slept. Island chieftains once met and reveled here. Here also for a time the most beautiful woman in Europe--Mary Stuart, as a captive--looked out at the sea.