Often the boy visited the deep, dry cave which his father had used as a workshop. Here the tools, the half-built engines, the chemicals, books and manuscripts of Atullos were stored. Torquane examined them all with a great and growing wistfulness, trying vainly to guess the secret of the machines, and spelling painfully, letter by letter, the words in the mouldering volumes, whose meaning he could not divine. Like a man who dwells in a dark place, yearning blindly for the sun, he felt himself on the threshold of a luminous world; but light was denied him, and all his strivings ended only in deeper confusion.

Often, as he grew older, his thoughts turned to the mystery of the high and guarded citadel from which his father had come down to join the tribesmen. From certain vantage points on the higher hills he could see its observatory towers looming darkly above the cleared eminence. His comrades, like their forefathers, shunned the neighborhood as a place of supernatural peril, where the Custodians’ thunderbolts would promptly strike down the intruder. For many years no one had beheld the Custodians; their voices which, it was said, had formerly spoken like the mountain thunder, threatening or warning the whole countryside, were no longer heard. But no man dreamt of penetrating their seclusion.

Torquane, however, knowing his kinship to the Custodians, wondered much concerning them. A strange curiosity drew him again and again to the hills below the laboratory. From such viewpoints, however, he could see nothing of the occupants or their activities. All was still and silent, and this very stillness, by degrees, emboldened the boy and drew him nearer to the dreaded eyrie.

Using all his stealth of woodcraft, and treading with utmost care lest a leaf or twig should crackle beneath him, he climbed one day the steep, heavily forested slope toward the building. Breathless with awe and apprehension, he peered at last from behind the bole of a gnarly pine that grew just beyond the verge of the laboratory grounds.

Grim, repellent, fortress-like, the rectilinear walls and square towers bulked above him against a heaven of light clouds. The windows glimmered blankly, withholding all their secrets. In the building’s front an open doorway arched, beyond which, in silver flashes, Torquane discerned the leaping of fountains amid a sunlit court.

Sapling firs and pines had begun to invade the level, cleared area of the grounds. Some of them were already shoulder-high, while others rose only to a man’s waist or knees, offering little obstruction to the view. Amid these miniature thickets Torquane heard a vengeful humming that might have been made by some invisible throng of bees. The sound maintained always the same position, the same pitch. Peering closely, he saw that there was a yard-wide line of bare, vacant soil running like a path amid the young conifers, and following the apparent course of the sound. This line, he knew suddenly, betokened the force-barrier beyond which no man could pass; and the humming was the noise made by the repellent, lethal power.

Much of the area between the saplings and the laboratory was filled with rows of vegetables, and there was also a small flower garden. The place bore evidence of careful tending and had been watered recently; but no one was in sight at the time. In the building itself, as Torquane stared and listened, there began a sonorous iron throbbing whose cause, in his complete ignorance of machinery, he could not imagine. Alarmed by the loudening noise, which seemed full of mysterious menace, Torquane fled on the wooded slope, and did not venture to return for many days.

Curiosity, and some emotion deeper than curiosity, whose nature and origin he could not have defined, impelled him to revisit the place in spite of his vague, half-superstitious fears and intuitions of danger.

Peering, as before, from the shelter of the ancient pines, he beheld for the first time one of the building’s occupants. At a distance of no more than twenty yards from his hiding-place, a girl was stooping above the violets and pansies in the trimly plotted flower garden.

Torquane thought that he gazed upon a goddess: for, among all the village girls, there was none half so lovely and graceful as this incredible being. Clad in a gown of light April green, her hair falling in a luminous yellow cloud about her shoulders, she seemed to cast a brightness on the flowers as she moved among them.

Drawn by a strange fascination such as he had never before experienced, the boy leaned from behind the sheltering pine, forgetful of his fears, and unconscious that he was exposing himself to view. Only when the girl happened to glance toward him, and gave a low, startled cry as her eyes met his, did he realize the indiscretion into which he had been betrayed.

Torquane was torn between the impulse of flight and a strong, unreasoned attraction that made him unwilling to go. This girl, he knew, was one of the Custodians; and the Custodians were demigods who wished no intercourse with men. Yet, through his father he was able to claim kinship with these lofty beings. And the girl was so beautiful, and her eyes, meeting his across the flower-plot, were so kind and gentle in spite of their startlement, that he ceased to apprehend the instant doom that his daring might perhaps have earned. Surely, even if he remained and spoke to her, she would not loose against him the dreadful lightning of the Custodians.

Raising his hand in a gesture of placation, he stepped forward among the seedling conifers, stopping only when he neared the vicious humming of the invisible force-barrier. The girl watched him with palpable amazement, her eyes widening, and her face paling and then reddening as she grew aware of Torquane’s comeliness and the undisguised ardor of his gaze. For a moment it seemed that she would turn and leave the garden. Then, as if she had conquered her hesitancy, she came a little nearer to the barrier.

“You must go away,” she said, in words that differed somewhat from those of the dialect familiar to Torquane. But he understood the words and to him their strangeness savored of divinity. Without heeding the admonition, he stood like one enchanted.

“Go quickly,” warned the girl, a sharper note in her voice. “It is not allowable that any barbarian should come here.”

“But I am not a barbarian,” said Torquane proudly. “I am the son of Atullos, the Custodian. My name is Torquane. Can we not be friends?”

The girl was plainly surprised and perturbed. At the mention of Atullos’ name, a shadow darkened her eyes; and behind the shadow an obscure terror seemed to lurk.

“No, no,” she insisted. “It is impossible. You must not come here again. If my father knew—”

At that instant the humming of the barrier deepened, loud and angry as the buzzing of a million wasps, and Torquane felt in his flesh an electric tingling, such as he had felt during violent thunderstorms. All at once the air was lined with sparks and bright fiery threads, and was swept by a wave of ardent heat. Before Torquane the little pines and firs appeared to wither swiftly, and some of them leapt into sudden flame.

“Go! go!” he heard the crying of the girl, as he fell back before the moving barrier. She fled toward the laboratory, looking back over her shoulder as she went. Torquane, half-blinded by the weaving webs of fire, saw that a man had appeared in the portals, as if coming to meet her. The man was old and white-bearded, and his face was stern as that of some irate deity.

Torquane knew that this being had perceived his presence. His fate would be that of the seared saplings if he lingered. Again a superstitious terror rose within him, and he ran swiftly into the sheltering gloom of the ancient forest.

Heretofore Torquane had known only the aimless longings of adolescence. He had cared little for any of the savage though often not uncomely maidens of the hill-people. Doubtless he would have chosen one of them in time; but, having seen the fair daughter of the Custodian, he thought only of her, and his heart became filled with a turmoil of passion that was all the wilder because of its overweening audacity and apparent hopelessness.