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.
