Again she listened, never moving a muscle. An owl hooted weirdly in the ivy far above her, while near, at her feet, a rabbit scuttled away through the grass. Such noises she was used to. She knew every night-sound of the country-side; for when she had finished her work in the library she often went, unknown to the household, with Stewart upon his nocturnal rounds, and walked miles through the woods in the night. The grey-eyed, thin-nosed head-keeper was her particular favourite. He knew so much of natural history, and he taught her all he knew. She could distinguish the cries of birds in the night, and could tell by certain sounds made by them, as they were disturbed, that no other intruders were in the vicinity. But that weird whispering, coming as it did from an undiscovered source, was inhuman and utterly uncanny.
Was it possible that her ears had deceived her? Was it one of the omens believed in by the superstitious? The wall whence the voices appeared to emanate was, she knew, about seven feet thick—an outer wall of the old keep. She was aware of this because in one of the folio tomes in the library was a picture of the castle as it appeared in 1510, taken from some manuscript of that period preserved in the British Museum. She, who had explored the ruins dozens of times, knew well that at the point where she was standing there could be no place of concealment. Beyond that wall, the hill, covered with bushes and brushwood, descended sheer for three hundred feet or so to the bottom of the glen. Had the voices sounded from one or other of the half-choked chambers which remained more or less intact she would not have been so puzzled; but, as it was, the weird whisperings seemed to come forth from space. Sometimes they sounded so low that she could scarcely hear them; at others they were so loud that she could almost distinguish the words uttered by the unseen. Was it merely a phenomenon caused by the wind blowing through some crack in the ponderous lichen-covered wall?
She looked beyond at the great dark yew, the justice-tree of the Grahams. The night was perfectly calm. Not a leaf stirred either upon that or upon the other trees. The ivy, high above and exposed to the slightest breath of a breeze, was motionless; only the going and coming of the night-birds moved it. No. She decided once and for all that the noise was that of voices, spectral voices though they might be.
Again she strained her eyes, when still again those soft, sibilant whisperings sounded weird and quite inexplicable.
Slowly, and with greatest caution, she moved along beneath the wall, but as she did so she seemed to recede from the sound. So back she went to the spot where she had previously stood, and there again remained listening.
There were two distinct voices; at least that was the conclusion at which she arrived after nearly a quarter of an hour of most minute investigation.
Once she fancied, in her excitement, that away in the farther corner of the ruined courtyard she saw a slowly moving form like a thin column of mist. Was it the Lady of Glencardine—the apparition of the hapless Lady Jane Glencardine? But on closer inspection she decided that it was merely due to her own distorted imagination, and dismissed it from her mind.
Those low, curious whisperings alone puzzled her. They were certainly not sounds that could be made by any rodents within the walls, because they were voices, distinctly and indisputably voices, which at some moments were raised in argument, and then fell away into sounds of indistinct murmuring. Whence did they come? She again moved noiselessly from place to place, at length deciding that only at one point—the point where she had first stood—could the sounds be heard distinctly. So to that spot once more the girl returned, standing there like a statue, her ears strained for every sound, waiting and wondering. But the Whispers had now ceased. In the distance the stable-clock chimed two. Yet she remained at her post, determined to solve the mystery, and not in the least afraid of those weird stories which the country-folk in the Highlands so entirely believed. No ghost, of whatever form, could frighten her, she told herself. She had never believed in omens or superstitions, and she steeled herself not to believe in them now. So she remained there in patience, seeking some natural solution of the extraordinary enigma.
But though she waited until the chimes rang out three o'clock and the moon was going down, she heard no other sound. The Whispers had suddenly ended, and the silence of those gaunt, frowning old walls was undisturbed. A slight wind had now sprung up, sweeping across the hills, and causing her to feel chill. Therefore, at last she was reluctantly compelled to quit her post of observation, and retrace her steps by the rough byroad to the house, entering by one of the windows of the morning-room, of which the burglar-alarm was broken, and which on many occasions she had unfastened after her nocturnal rambles with Stewart. Indeed, concealed under the walls she kept an old rusted table-knife, and by its aid it was her habit to push back the catch and so gain entrance, after reconcealing the knife for use on a future occasion.
On reaching her own room she stood for a few moments reflecting deeply upon her remarkable and inexplicable discovery. Had the story of those whisperings been told to her she would certainly have scouted them; but she had heard them with her own ears, and was certain that she had not been deceived. It was a mystery, absolute and complete; and, regarding it as such, she retired to bed.