They set out on the following morning. Elaborate preparations had been made for the undertaking and, so that they might have ample time undisturbed, Doris had begged her mother to allow her to picnic for the day with Sally, and not come back to the hotel for luncheon. As Mrs. Craig had come to have quite a high opinion of Sally, her judgment and knowledge of the river and vicinity, she felt no hesitation in trusting Doris to be safe with her.
Sally had provided the sandwiches and Doris was armed with fruit and candy and books to amuse Genevieve. In the bow of the boat Sally had stowed away a number of tools borrowed from her father's boathouse. Altogether, the two girls felt as exited and mysterious and adventurous as could well be imagined.
"I wish we could have left Genevieve at home," whispered Sally as they were embarking. "But there 's no one to take care of her for all day, so of course it was impossible. But I 'm afraid she 's going to get awfully tired and restless while we 're working."
"Oh, never you fear!" Doris encouraged her. "I 've brought a few new picture-books and we 'll manage to keep her amused somehow."
Once established in the cave, having settled Genevieve with a book, the girls set to work in earnest.
"I 'm glad I thought to bring a dozen more candles," said Sally. "We were down to the end of the last one. Now shall we begin on that corner at the extreme right-hand away from the door? That 's the likeliest place. I 'll measure a space around it twenty-one inches square."
She measured off the space on the floor carefully with a folding ruler, while Doris stood over her watching with critical eyes. Then, having drawn the lines with a piece of chalk, Sally proceeded to begin on the sawing operation with one of her father's old and somewhat rusty saws.
It was a heartbreakingly slow operation. Turn and turn about they worked away, encouraging each other with cheering remarks. The planks of the old Anne Arundel were very thick and astonishingly tough. At the end of an hour they had but one side of the square sawed through, and Genevieve was beginning to grow fractious. Then they planned it that while one worked, the other should amuse the youngest member of the party by talking, singing, and showing pictures to her.
This worked well for a time, and a second side at last was completed. By the time they reached the third, however, Genevieve flatly refused to remain in the cave another moment, so it was agreed that one of them should take her outside while the other remained within and sawed. This provided by far the best solution yet, as Genevieve very shortly fell asleep on the warm pine needles. They covered her with a shawl they had brought, and then both went back to the undertaking, of which they were now, unconfessedly, very weary.
It was shortly after the noon hour when the saw made its way through the fourth side of the square. In a hush of breathless expectation, they lifted the piece of timber, prepared for - who could tell what wondrous secret beneath it?
The space it left was absolutely empty of the slightest suggestion of anything remarkable. It revealed the sandy soil of the embankment into which the cave was dug, and nothing else whatever. The disgusted silence that followed Doris was the first to break.
"Of course. something may be buried down here, but I doubt it awfully. I 'm sure we would have seen some sign of it, if this had been the right corner. However, give me that trowel, Sally, and we 'll dig down a way." She dug for almost a foot into the damp sand, and finally gave it up.
"How could any one go on digging down in the space of only twenty-one inches?" she exclaimed in despair. "If one were to dig at all, the space ought to be much larger. No, this very plainly is n't the right corner. Let 's go outside and eat our lunch, and then, if we have any courage left, we can come back and begin on another corner. Personally, I feel as if I should scream, if I had to put my hand to that old saw again!"
But a hearty luncheon and a half hour of idling in the sunlight above ground after it, served to restore their courage and determination. Sally was positive that the corner diagonally opposite was the one most likely to yield results, and Doris was inclined to agree with her. Genevieve, however, flatly refused to reenter the cave so they were forced to adopt the scheme of the morning, one remaining always outdoors with her, as they did not dare let her roam around by herself. Sally volunteered to take the first shift at the sawing, and after they had measured off the twenty-one inch square in the opposite corner she set to work, while Doris stayed outside with Genevieve.
Seated with a picture-book open on her lap, and with Genevieve cuddled close by her side, she was suddenly startled by a muffled, excited cry from within the cave. Obviously, something had happened. Springing up, she hurried inside, Genevieve trailing after her. She beheld Sally standing in the middle of the cave, candle in hand, disheveled and excited, pointing to the side of the cave near which she had been working.
"Look, look!" she cried. "What did I tell you?" Doris looked, expecting to see something about the floor in the corner to verify their surmises. The sight that met her eyes was as different as possible from that.
A part of the wall of the cave, three feet in width and reaching from top to bottom had opened and swung inward like a door on its hinges.
"What is it?" she breathed in a tone of real awe.
"It 's a door, just as it looks," explained Sally, "and we never even guessed it was there. I happened to be leaning against that part of the wall as I sawed, balancing myself against it, and sometimes pushing pretty hard. All of a sudden it gave way, and swung out like that, and I almost tumbled in. I was so astonished I hardly knew what had happened!"
"But what 's behind it?" cried Doris, snatching the candle and hurrying forward to investigate. They peered together into the blackness back of the newly revealed door, the candle held high above their heads.
"Why, it 's a tunnel!" exclaimed Sally. "A great, long tunnel, winding away. I can't even see how far it goes. Did you ever?"
The two girls stood looking at each other and at the opening in a maze of incredulous speculation.
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