Darrell had learned of his partner's death, and waited anxiously for years to hear from the Peveril heirs. As they remained silent, and made no claim against the property in which his own life was so completely bound up, he cherished the belief that they considered it too worthless even to investigate, and that he would be left in undisturbed possession to the end. He became so emboldened by this belief that, when the term of contract had so nearly expired that it had but a few months more to run, he even began in a small way to resume work in the mine. Thus he had it pumped out and partially retimbered. He also started work on a new level, and in every way possible, without attracting too much attention, got his property ready for the great scheme of development upon which he was determined the moment he should be freed from his contract.

In the meantime his wife had died, and his only child, who had been born since he entered upon this strange existence, had come to share his lonely home. As she was but twelve years old when this great change in her life took place, she of course knew nothing of business, and had never heard of such a thing as smuggled goods. In her eyes everything that her dear papa did was right, and she was too happy at being permitted to become in any degree his assistant to think of questioning his methods.

So the secret of the cavern and its underground connection was finally confided to her. She was also intrusted with the duty of watching for the little vessels that brought the goods in which her father dealt, and of hanging out the signal-lights by which their movements were guided. As these lights were always displayed from the stunted cedar at the mouth of the cavern, and as this place also served her for a post of observation, she passed much of her time within the limits of the great cave.

Her father had won her promise never to mention the existence of the cavern, and had also warned her not to allow herself to be seen in it. There was, however, no necessity of such a warning, for Mary Darrell was too proud of her great secret to share it. Even Aunty Nimmo, the old black nurse who had come West with her, and had remained to care for her ever since, was not told of the cavern, though she shrewdly suspected its existence.

If to the foregoing explanation it is added that the little trading-vessels, which were also to all appearance fisher-boats, never took on their return cargoes from the cavern, but always at either Laughing Fish Cove or the land-locked basin, the situation as it existed at the time of Peveril's appearance on the scene will be understood.

As the sister schooner of the one that had carried off Joe Pintaud was due to arrive at about this date, Mary Darrell was keeping a sharp watch for it, and paying frequent visits to her post of observation at the mouth of the cavern for that purpose. On each of these she of course drew aside the painted curtain, thereby letting in a rush of air that penetrated to the innermost recesses of the great cavity behind her.

It was a little breath from one of these that, finding its way through the aperture beside the slab of rock, and so on down the narrow passage that led to the prehistoric mine, had blown out Peveril's candle. Of course the girl, who was the innocent cause of that bit of mischief, had no idea of what the breeze was doing, for neither she nor her father, or any one else for that matter, knew of the existence of the old workings so close at hand.

On the following morning Mary again entered the cavern, singing light-heartedly as she did so. This time she remained but a few minutes, for she had something to attend to in the house; but she held aside the canvas curtain long enough to look out, assure herself that no vessel was in sight, and to allow another inrush of air. From it a second little breeze found its way beneath the great slab and into the darkness of the underground passage, where it restored poor, despairing Peveril to life and hope by cooling his fevered brow and carrying the sound of singing to his ears.

The very next time the girl entered the cavern she was at first bewildered to find the canvas screen drawn aside from its opening and the place flooded with light. Next she was frightened to note that the derrick was swung outward, and that its attached tackle was hanging down out of sight.

Her first impulse was to run and call her father. Then she remembered that, as he was down in the mine, it would be a long time before he could come. Also, being a brave young woman and not easily frightened, she determined to find out for herself if there was any real cause for alarm. So she crept softly to the mouth of the cavern and peered cautiously out.