She went on, however, looking carefully into every tiny cavity; but always with the same result. No Aster was to be seen: only huge spiders and squatting frogs stared at her from every cranny. And, as she climbed up higher and higher, she found that the rocky wall was like a giant staircase; and when she looked back, noticing that the stones she displaced, as she climbed up, only rolled a short time and then made no noise as they fell, and thinking that after her search was over she would return to the little spring and wait there patiently until the moon rose again, when, as she hoped, Aster, if she did not find him now, would wake up and come back to her, she saw that she could never return to the spring. For the steps by which she had come were gone, melting one by one into the face of the rock, changing into a steep precipice behind her; and at its foot were curling mists and vapors, among which she saw dimly the hateful, mocking faces she had seen before. Go back she could not, for every step, as she passed it, melted into the precipice; to look back made her dizzy. She must go upward. For the first time since she had begun to climb the wall, which had changed, as she climbed, into steps, and then into a precipice, Eva was afraid. But there was no choice left for her; go on she must; and, accordingly, on she went, till she came to a place where the rock rose, so high that she could not see its top, in a smooth, unbroken wall, over which she could not possibly climb, and a narrow path ran along its base; and as yet she had not seen nor heard anything of the truant Aster. She walked slowly along the foot of the great blank wall, tired and discouraged. What to do now, she did not know. She could not go back, for there was the frightful precipice; in front was the wall, along which she was walking. Poor Eva was almost ready to cry, when all of a sudden she saw a door, cut in the stone, and the door was shut. But she heard, behind this door, the silvery voices and ringing laughter of children, and then a great longing came over her to go in and join them, and she thought that perhaps Aster might be with them. Yet, although she tried, she could not open the door. She heard the merry voices of the children, and, hearing them as plainly as she did, she thought it was strange that they did not hear her and open the door to her; for, try as she would, she could not open it. And then she grew tired of trying, and would have gone on, when, looking once more at the door to see if there was any way of opening it which she could possibly have neglected, she saw cut across the door, in deep, old-fashioned, moss-grown letters, the word Knock. Then, gathering courage, Eva raised her tiny hand, and knocked. Once, and no answer came. Again, and with the same result. A third time, and then the merry voices of the children, and their gay laughter, ceased, and Eva hoped that her appeal was heard. [Illustration] CHAPTER X. _THE VALLEY OF REST._