Or was Alan the vain dreamer? That, indeed, might well be. Mayhap he had heard some fantastic tale from Morag MacNeill, or from old Marsail Macrae; the islanders had sgeul after sgeul of a wild strangeness.
In silence he guided the boats back into the outer arcade, where a faint sheen of moonlight glistened on the water. Thence, in a few minutes, he oared that wherein he and Alan sat, with the other fastened astern, into the open.
When the moonshine lay full on Alan's face, Ian saw that he was thinking neither of himself nor of where he was. His eyes were heavy with dream.
What wind there was blew against their course, so Ian rowed unceasingly. In silence they passed once again the headland of Aoidhu; in silence they drifted past a single light gleaming in a croft near Aonaig—a red eye staring out into the shadow of the sea, from the room where the woman Marsail lay dying; and in silence their keels grided on the patch of shingle in Caisteal-Rhona haven.
For days thereafter Alan haunted that rocky, cavernous wilderness where he had seen the Herdsman.
It was in vain he had sought everywhere for some tidings of this mysterious dweller in those upland solitudes. At times he believed that there was indeed some one upon the island of whom, for inexplicable reasons, none there would speak; but at last he came to the conviction that what he had seen was an apparition, projected by the fantasy of overwrought nerves. Even from the woman Morag MacNeill, to whom he had gone with a frank appeal that won its way to her heart, he learned no more than that an old legend, of which she did not care to speak, was in some way associated with his own coming to Rona.
Ian, too, never once alluded to the mysterious incident of the green arcades which had so deeply impressed them both: never after Alan had told him that he had seen a vision.
But as the days passed, and as no word came to either of any unknown person who was on the island, and as Alan, for all his patient wandering and furtive quest, both among the upland caves and in the green arcades, found absolutely no traces of him whom he sought, the belief that he had been duped by his imagination deepened almost to conviction.
As for Ian, he, unlike Alan, became more and more convinced that what he had seen was indeed no apparition. Whatever lingering doubt he had was dissipated on the eve of the night when old Marsail Macrae died. It was dusk when word came to Caisteal-Rhona that Marsail felt the cold wind on the soles of her feet. Ian went to her at once, and it was in the dark hour which followed that he heard once more, and more fully, the strange story which, like a poisonous weed, had taken root in the minds of the islanders. Already from Marsail he had heard of the Prophet, though, strangely enough, he had never breathed word of this to Alan, not even when, after the startling episode of the apparition in the Teampull-Mara, he had, as he believed, seen the Prophet himself. But there in the darkness of the low, turfed cottage, with no light in the room save the dull red gloom from the heart of the smoored peats, Marsail, in the attenuated, remote voice of those who have already entered into the vale of the shadow, told him this thing, in the homelier Gaelic—
"Yes, Ian mac Iain-Bàn, I will be telling you this thing before I change. You are for knowing, sure, that long ago Uilleam, brother of him who was father to the lad up at the castle yonder, had a son? Yes, you know that, you say, and also that he was called Donnacha Bàn? No, mo-caraid, that is not a true thing that you have heard, that Donnacha Bàn went under the waves years ago. He was the seventh son, an' was born under the full moon; 'tis Himself will be knowing whether that was for or against him. Of these seven none lived beyond childhood except the two youngest, Kenneth an' Donnacha. Kenneth was always frail as a February flower, but he lived to be a man. He an' his brother never spoke, for a feud was between them, not only because that each was unlike the other, an' the younger hated the older because through him he was the penniless one, but most because both loved the same woman. I am not for telling you the whole story now, for the breath in my body will soon blow out in the draught that is coming upon me; but this I will say to you: darker and darker grew the gloom between these brothers. When Giorsal Macdonald gave her love to Kenneth, Donnacha disappeared for a time. Then, one day, he came back to Borosay, an' smiled quietly with his cold eyes when they wondered at his coming again. Now, too, it was noticed that he no longer had an ill-will upon his brother, but spoke smoothly with him an' loved to be in his company. But to this day no one knows for sure what happened. For there was a gloaming when Donnacha Bàn came back alone in his sailing-boat. He an' Kenneth had sailed forth, he said, to shoot seals in the sea-arcades to the west of Rona, but in these dark and lonely passages they had missed each other. At last he had heard Kenneth's voice calling for help, but when he had got to the place it was too late, for his brother had been seized with the cramps, an' had sunk deep into the fathomless water. There is no getting a body again that sinks in these sea-galleries. The crabs know that.