The whole situation of Cruden is peculiar. The main stream, the Water of Cruden, runs in a south-easterly direction, skirts the sandhills, and, swirling under the stone bridge, partly built with the ruins of the old church which Malcolm erected to celebrate his victory over Sueno, turns suddenly to the right and runs to sea over a stony bottom. The estuary has in its wash some dangerous outcropping granite rocks, nearly covered at high tide, and the mouth opens between the most northerly end of the sandhills and the village street, whose houses mark the slope of the detritus from the rocks. Formerly the Water of Cruden, instead of taking this last turn, used to flow straight on till it joined the lesser stream known as the Back Burn, and together the streams ran seawards. Even in comparatively recent years, in times of flood or freshet, the spate broke down or swept over the intervening tongue of land, and the Water of Cruden took its old course seaward. This course is what is known as the Watter's Mou'. It is a natural cleft - formed by primeval fire or earthquake or some sort of natural convulsion - which runs through the vast mass of red granite which forms a promontory running due south. Water has done its work as well as fire in the formation of the gully as it now is, for the drip and flow and rush of water that mark the seasons for countless ages have completed the work of the pristine fire. As one sees this natural mouth of the stream in the rocky face of the cliff, it is hard to realise that Nature alone has done the work.
At first the cleft runs from west to east, and broadens out into a wide bay of which on one side a steep grassy slope leads towards the new castle of Slains, and on the other rises a sheer bank, with tufts of the thick grass growing on the ledges, where the earth has been blown. From this the cleft opens again between towering rocks like what in America is called a canon and tends seaward to the south between precipices two hundred feet high, and over a bottom of great boulders exposed at low water towards the northern end. The precipice to the left or eastward side is twice rent with great openings, through which, in time of storm, the spray and spume of the easterly gale piling the great waves into the Castle Bay are swept. These openings are, however, so guarded with masses of rock that the force of the wildest wave is broken before it can leap up the piles of boulders which rise from their sandy floors. At the very mouth the cleft opens away to the west, where the cliff falls back, and seaward of which rise great masses of black frowning rock, most of which only show their presence at high water by the angry patches of foam which even in calm weather mark them - for the current here runs fast. The eastern portal is composed of a giant mass of red granite, which, from its overhanging shape, is known as "the Ship's Starn". It lies somewhat lower than the cliff of which it is a part, being attached to it by a great sloping shelf of granite, over which, when the storm is easterly, the torrent of spray sent up by the dashing waves rolls down to join the foamy waves in the Watter's Mou'.
Maggie knew that close to the Barley Mill, safe from the onset of the waves - for the wildest waves that ever rise lose their force fretting and churning on the stony sides and bottom of the Watter's Mou' - was kept a light boat belonging to her brother, which he sometimes used when the weather was fine and he wanted to utilise his spare time in line fishing. Her mind was made up that it was her duty to give her father warning of what awaited him on landing - if she could. She was afraid to think of the danger, of the myriad chances against her success; but, woman-like, when once the idea was fixed in her mind she went straight on to its realisation. Truly, thought of any kind would have been an absolute barrier to action in such a case, for any one of the difficulties ahead would have seemed sufficient. To leave the shore at all on such a night, and in such a frail craft, with none but a girl to manage it; then to find a way, despite storm and current, out to the boat so far off at sea; and finally, to find the boat she wanted at all in the fret of such a stormy sea - a wilderness of driving mist - in such a night, when never a star even was to be seen: the prospect might well appal the bravest.
But to think was to hesitate, and to hesitate was to fail. Keeping her thoughts on the danger to her father, and seeing through the blackness of the stormy night his white, woe-laden face before her, and hearing through the tumult of the tempest his sobs as on that night when her fear for him began to be acute, she set about her work with desperate energy. The boat was moored on the northern side of the largest of the little islands of sea-grass, and so far in shelter that she could get all in readiness. She set the oars in their places, stepped the mast, and rigged the sail ready to haul up. Then she took a small spar of broken wood and knotted to it a piece of rope, fastening the other end of the rope, some five yards long, just under the thwarts near the centre of the boat, and just a little forward on the port side. The spar she put carefully ready to throw out of the boat when the sweep of the wind should take her sail - for without some such strain as it would afford, the boat would probably heel over. Then she guided the boat in the shallow water round the little island till it was stern on to the sea side. It was rough work, for the rush and recoil of the waves beat the boat back on the sandy bank or left her now and again dry till a new wave lifted her.
All this time she took something of inspiration from the darkness and the roar of the storm around her. She was not yet face to face with danger, and did not realise, or try to realise, its magnitude. In such a mystery of darkness as lay before, above, and around her, her own personality seemed as nought.