Behind the shrubberies, which lay at the back of the holly hedge that surrounded the little enclosed garden outside the library, beyond the end of the battlements, and reached by a disused footpath, a great tree stood upon the edge of the steep hillside and thrust its sweeping branches over the void.

Its trunk was grey and moss-grown; moss carpeted the ground between its protruding roots, but the bracken and heather held back, and left a half-circle beneath it, untenanted by their kind. It would seem that all vegetation fears to venture beneath the shade of the beech; and for the most part it stands solitary, shunned by other growing things except moss, which creeps undaunted where its more vigorous brothers lack the courage to establish themselves.

Here came Juliet that morning.

A week ago, David Southern had shown her the path to the tree. It had been a favourite haunt of his when he was a boy, he told her. It was a private chamber to which he resorted on the rare occasions when he was disposed to solitude; when something had gone wrong with his world he had been used to retire there with his dog, or, more seldom, a book. There he had been accustomed to lie, his back supported by the tree, and hold forth to the dog upon the troubles and difficulties of life and the general crookedness of things; or, if a book were his companion, he would gaze out, between the pages, at distant Crianan clinging faintly to the knees of Ben Ghusy, and watch the swift change of passing cloud and hanging curtain of mist upon the faces of the hills and loch.

It had been a place all his own; secret from every one, even from Mark, his companion during all those holidays that he had spent at Inverashiel. Somehow, David told Juliet—and it was a confidence he had seldom before imparted to anyone—he had never quite managed to hit it off with Mark. He couldn't say why, exactly. No doubt it was his own fault; but there was no accounting for one's likes and dislikes.

And with quick regret at having betrayed his carefully suppressed feelings in regard to his cousin, David had laughed apologetically, and spoken of other things.

Here, then, just as the steamer Rob Roy was drawing close to the wooden landing-stage at the edge of the loch, with Julia Romaninov still standing in the bows; here, because she had once been to this place with him, because without her he had so often sat upon these mossy roots, came Juliet to dream of her love.

Like him, she seated herself against the tree trunk at the giddy brink of the precipitous rock; like him, her eyes rested on the smooth waters below her, or on the far-away misty distance where Crianan slumbered; but, unlike him, her eyes, as they looked, were filled with tears. Where was he now? Oh, David, poor unjustly treated David! In what narrow cell, lighted only by a high, iron-barred window—for so the scene shaped itself in her mind—with uncovered floor of stone, bare walls and a bench to lie on, was the man she loved wearing away his days under the burden of so frightful an accusation?

For the thousandth time Juliet's blood boiled within her at the thought, and she grew hot with anger and indignant scorn. That anyone should have dared to suspect him! Why were such fools, such wicked, evil-working imbeciles as the police allowed to exist for one moment upon the face of the globe? But no doubt they had some hidden motive in arresting him, for it was quite incredible that they really imagined he had committed this appalling crime. She could not understand their motive, to be sure, but without doubt there must have been some reason which was not clear to her.

Oh, David, David! Was he thinking of her, as she was thinking of him? Did he know, by instinct, that she would be doing all that could be done to bring about his release? But was she? Again her mind was filled with the disquieting question, was there nothing that might be done, that she was leaving undone? Had she forgotten something, neglected something? She was sure Gimblet did not believe David to be guilty, but was he certain of being able to prove his innocence? He did not seem to have discovered much at present.

Suddenly, in the midst of her distress, she smiled to herself.

At least Miss Tarver had shown herself in her true colours, and was no more to be considered. Juliet felt that she could almost forgive her for her readiness to believe the worst. It was dreadful, yes, and shameful that anyone else should think for a moment that David could be capable of such a deed, but in Miss Tarver, perhaps, the thought had not been inexcusable. On the whole, it was so nice of her to break the engagement that she might be forgiven the ridiculous reason she had advanced for doing it. Of course, Juliet assured herself, it was a mere pretext, because no one could possibly believe it. And in this manner she continued to reiterate her conviction that the suspicions entertained of her lover were all assumed for some darkly obscure purpose.

So the morning wore away. A shower or two passed down the valley, but under the thick tent of the beech leaves she scarcely felt it. She was, besides, dressed for bad weather; and the grey and mournful face of the day was in harmony with her mood.

There was something comforting in this high perch. She seemed more aloof from the troubles and despair of the last few days than she had imagined possible. There was a calm, a remoteness, about the grey mountains, disappearing and reappearing from behind their screen of cloud but unchanged and unmoved by what went on around and among them, that was in some way reassuring.

The burn that ran at the bottom of the hill on which she sat, hurrying down to the loch in such turbulent foaming haste, she was able to compare, with a sad smile, to herself. The loch, she thought, was wide and impassive as justice, which did not allow itself to be influenced by the emotions. The burn would get down just the same without so much turmoil and fuss; and she would see David's name cleared, equally surely, if she waited calmly on events, instead of burning her heart out in hopeless impatience and anxiety.

As she gazed, with some such thoughts as these, down to the stream that splashed on its way below her, her attention was caught by a movement in the bushes half-way down the steep slope at the top of which she was sitting.

The day was windless and no leaf moved on any tree. There must be some animal among the shrubs that covered the embankment, some large animal, since its movements caused so much commotion; for, as she watched, first one bush and then another stirred and bent and was shaken as if by something thrusting its way through the dense growth.

What could it be? A sheep, perhaps; there were many of them on the hillsides. This must be one that had strayed far from the rest. And yet would a sheep make so much stir? Juliet drew back a little behind the trunk of the beech-tree. Could it be a deer? She could not hear any sound of the creature's advance, for the air was full of the clamour of the burn, but she could trace the direction of its progress by shaking leaves and swinging boughs. It seemed to be gradually mounting the slope.

Suddenly a head emerged from the waving mass of a rhododendron, and with astonishment Juliet saw that it was that of Julia Romaninov.

Her first impulse was to lean forward and call her, but as she did so the cry died unheard upon her lips. For the manner of Julia's advance struck her as very odd. The girl was bending nearly double, and moving with a caution that seemed very strange and unnecessary. What was the matter? Was she stalking something? Crouching as she was in the bushes, she would not be seen by anyone on the path below. Did she not want to be seen? It looked more and more like it. But why in the world should Julia creep along as if she feared to be observed? Where was she going, and why?

Suddenly Juliet came to a quick decision: she would find out what Julia
Romaninov was doing.

She backed hurriedly into the bracken, and made her way slowly and cautiously around the clearing under the beech-tree to the edge of the hill again, keeping under cover of the fern and heather. When she peered over, Julia had disappeared from view beneath the rhododendrons.

For a minute Juliet's eyes searched the side of the slope below. Then she drew back her head quickly, for she had caught sight of another bush shaking uneasily a little way beyond the gap in which she had had her first glimpse of the cause of the disturbance. Cowering low in the bracken she crept along the top, keeping a foot or two from the edge, where the rock fell nearly perpendicularly for a few yards before its angle changed to the comparatively gradual, though actually steep slope of the hill which Julia was climbing.

From time to time she looked cautiously between clumps of fern or heath, to make sure that she was keeping level with her unconscious quarry.

The front of the hill swung round in a bold curve till it reached the castle; and it soon became evident that, if both girls continued to advance along the lines they were following, they would converge at a point where the end of the battlemented wall met the great holly hedge that formed two sides of the garden enclosure.

Juliet perceived this when she was not more than a dozen yards from the corner, and dropped at full length to the soft ground, at a spot where she could see between the stalks and under the leaves, and yet herself remain concealed. She had not long to wait. In a minute, Julia's face appeared over the brow of the hill. She pulled herself up by a young fir sapling that hung over the brink, and stood for a moment, flushed and panting after her long climb. She was dressed in a greenish tweed, which blended with the woodland surroundings, and her shoulder was turned to the place where Juliet lay wondering whether she would be discovered.

Fronting them, the end of the little turret, with which the wall of the old fortress now came to a sudden termination, could be seen rearing its grey stones above the dark glossy foliage of the hedge, which grew here with peculiar vigour and continued to the extreme edge of the cliff, and even farther.

What was Juliet's surprise to see Julia, when she had found her breath, and taken one quick look round as if to satisfy herself she was unobserved, suddenly cast herself down, in her turn, upon the damp earth, and inserting her head beneath the prickly barricade of the holly leaves, begin to crawl and wriggle forward until she had completely disappeared under it. What in the world could she be doing?

Minutes passed, and she did not reappear. Juliet waited, her nerves stretched in expectation, but nothing happened. Overhead little birds, tomtits and creepers, played about the bark of the fir-trees; a robin came and looked at her consideringly, with a bright sensible eye; from two hundred feet below, the murmur of the burn rose constant and insistent; but no other sound broke the stillness, nor was there any sign of human life upon the top of the cliff.

At last the girl could stand it no longer. Her patience was exhausted. Curiosity urged her like a goad; and, if she had not much expectation of making any important discovery, she was at least determined to solve the mystery that now perplexed her.

Without more ado she got to her feet, and ran to the holly hedge. There, throwing herself down once more, she parted the leaves with a cautious hand, and followed the path taken by the Russian.

The hedge was old and very thick, more than three yards in width at this end of it. In the middle, the trunks of the trees that formed it rose in a close-growing, impassable barrier; but just opposite the place where Julia had vanished Juliet found that there was a gap, caused, perhaps, by the death in earlier days of one of the trees, or, as she afterwards thought more likely, by the intentional omission or destruction of one of the young plants. It was a narrow opening, but she managed to wriggle through it.

On the other side, progress was bounded by the wall, whose massive granite blocks presented a smooth unbroken surface. Where, then, had Julia gone? The branches did not grow low on this, as on the outer side of the hedge, and there was room to stand, though not to stand upright. Stooping uncomfortably, the girl looked about her, and saw in the soft brown earth the plain print of many footsteps, both going and coming, between the place where she crouched and the end of the wall. She looked behind her, and there were no marks. Clearly, Julia had gone to the end; but what then? The corner of the wall was at the very edge of the precipice; from what she remembered to have seen from below, the rock was too sheer to offer any foothold; besides why, having just climbed to the summit should anyone immediately descend again, and by such an extraordinary route? While these thoughts followed one another in her mind, Juliet had advanced along the track of the footsteps, and clinging tightly to the trunk of the last holly bush she leant forward and looked down.

As she thought, the descent was impossible: the rock fell away at her feet, sheer and smooth; there was no path there that a cat could take. It made her giddy to look, and she drew back hurriedly.

Where, then, could Julia have gone? Not to the left, that was certain, for then she would have emerged again into view. To the right? That seemed impossible. Still, Juliet leant forward again, and peered round the corner of the wall.

There, not more than a couple of feet away, was a small opening, less than eighteen inches wide by about a yard in height. Hidden by the overhanging end of the hedge, it would be invisible from below. Here was the road Julia had taken.

Juliet did not hesitate. She could reach the aperture easily, and it would have been the simplest thing in the world to climb into it, but for the yawning chasm beneath. Holding firmly to the friendly holly, and resisting, with an effort, the temptation to look down, she swung herself bravely over the edge and scrambled into the hole with a gasp of relief. It was, after all, not very difficult. She found herself standing within the entrance of a narrow passage built into the thickness of the wall. Beside the opening through which she had come, a little door of oak, grey with age and strengthened with rusty bars and cross-pieces of iron, drooped upon its one remaining hinge. Two huge slabs of stone leaning near it, against the wall, showed how it had been the custom in former centuries to fortify the entrance still more effectively in time of danger.

Juliet did not wait to examine these fragments, interesting though they might be to archaeologists, but hurried down the passage as quickly as she could in the darkness that filled it, feeling her way with an outstretched hand upon the stones on either side. As her eyes became accustomed to the obscurity, she saw that though the way was dark it was yet not entirely so: a gloomy light penetrated at intervals through ivy-covered loopholes pierced in the thickness of the outer wall; and she imagined bygone McConachans pouring boiling oil or other hospitable greeting through those slits on to the heads of their neighbours. But surely, she reflected, no one would ever have attacked the castle from that side, where the precipice already offered an impregnable defence; the passage must have been used as a means of communication with the outer world, or, perhaps, as a last resort, for the purpose of escape by the beleaguered forces.

After fifty yards or so of comparatively easy progress, the shafts of twilight from the loopholes ceased to permeate the murky darkness in which she walked, and she was obliged to go more slowly, and to feel her way dubiously by the touch of hands and feet.

The floor appeared to her to be sloping away beneath her, and as she advanced the descent became more and more rapid, till she could hardly keep her feet. She went very gingerly, with a vague fear lest the path should stop unexpectedly, and she herself step into space.

Presently she found herself once more upon level ground, when another difficulty confronted her: the walls came suddenly to an end. Feeling cautiously about her in the darkness, she made out that she had come to a point where another passage crossed the one she was following, a sort of cross-road in this unknown country of shade and stone. Here, then, were three possible routes to take, and no means of knowing which of them Julia Romaninov had gone by.

After a little hesitation, she decided to keep straight on. It would at all events be easier to return if she did, and she would be less likely to make a mistake and lose her way. So on she stumbled; and who shall say that Fate had not a hand in this chance decision?

Though the distance she had traversed was inconsiderable, the darkness and uncertainty made it appear to her immense, and each moment she expected to come upon the Russian girl. At every other step she paused and listened, but no sound met her ears except a slight, regular, thudding noise, which she presently discovered, with something of a shock, to be the beating of her own heart. The sound of her progress was almost inaudible. As the day was damp, she was wearing goloshes, and her small, rubber-shod feet fell upon the stone floor with a gentle patter that was scarcely perceptible.

At last she nearly fell over the first step of a flight of stairs.

She mounted them one by one with every precaution her fears could suggest. For by now the first enthusiasm of the chase had worn off, and the solitude and darkness of this strange place had worked upon her nerves till she was terrified of she knew not what, and ready to scream at a touch.

Already she bitterly regretted having started out upon this enterprise of spying. Why had she not gone and reported what she had seen to Mr. Gimblet? That surely would have been the obvious, the sensible course. It was, she reflected, a course still open to her; and in another moment she would have turned and taken it, but even as the thought crossed her mind she was aware that the darkness was sensibly decreased, and in another second she had risen into comparative daylight. As she stood still, debating what she should do, and taking in all that could now be distinguished of her surroundings, she saw that the stairs ended in an open trap-door, leading to a high, black-lined shaft like the inside of a chimney, in which, some two feet above the trap, an odd, narrow curve of glass acted as a window, and admitted a very small quantity of light. A streak of light seemed to come also from the wall beside it.

Juliet drew herself cautiously up, till her head was in the chimney, and her eyes level with the slip of glass.

With a sudden shock of surprise she saw that she was looking into the room which, above all others, she had so much cause to remember ever having entered.

It was, indeed, the library of the castle, and she was looking at it from the inside of that clock into which Gimblet had once before seen Julia Romaninov vanish.

The curtains were drawn in the room, but after the absolute blackness of the stone corridors the semi-dusk looked nearly as bright as full daylight to Juliet, and she had no difficulty in distinguishing that there was but one person in the library, and that person Julia.

She was standing by a bookshelf at the far end, near the window, and seemed to be methodically engaged in an examination of the books. Juliet saw her take out first one, then another, musty, leather-bound volume, shake it, turn over the leaves, and put it back in its place after groping with her hand at the back of the shelf. Plainly she was hunting for something. But for what? She had no business where she was, in any case, and Juliet's indignation gathered and swelled within her as she watched this unwarrantable intrusion.

She would confront the girl and ask her what she meant by such behaviour.
But how to get into the library?

Looking about her, she saw that the streak of light in the wall beside her came through a perpendicular crack which might well be the edge of a little door.

She pushed gently and the wood yielded to her fingers.