"Come, let me guide you," she said, taking my arm and leading me to the wall. "Lift your foot, so!" and taking my foot, she placed it in a kind of narrow step in the rough stone wall, at the same time placing my hand upon a piece of iron that seemed to be a large nail driven into the masonry. "Now climb very carefully," she went on. Without hesitation, I raised myself from the ground slowly, and with infinite care commenced to scale the wall, while she remained below, wading almost up to her waist in water. "Take care that you don't strike your head," she cried warningly. "Above you is a small hole just large enough for you to get through. Be very careful, and take your time." The one hand at liberty I stretched above my head, and found, as she described, a square hole in the roof of the place, and, grasping the stone, I eventually managed to escape through it, finding myself at last standing upon a boarded floor. A few moments later she was again at my side, and by the clang of iron I knew that the aperture of that fatal place was closed again. I inquired of her where we were, but she only replied-- "I've already explained to you that to seek to elucidate the mystery of these adventures of yours is entirely useless. We have promised to each other mutual faith. That is, in itself, sufficient." Then, taking my arm, she hurriedly led me across the room, up some steps, and along two long passages that ran at right angles to each other, until at length we emerged into the street. Where we were I had not the slightest idea. I only knew that we were beside the river bank, for upon my ears there fell the shrill whistle of a steam-tug. With her arm linked in mine, and heedless of the water dripping from her skirts, she led me forward through a number of narrow turnings, until by the bustle about me I knew that we must have reached a main road. I heard the approaching hoot of a taxi, and the vehicle, at her demand, pulled up at the kerb. "We must now part," she said, in a low, earnest voice. "Remember that in this remarkable affair our interests are absolutely identical. Any order that you receive you will obey without seeking to discover the why or wherefore, and above all, silence to the police." "I have promised," I answered. "And whatever may occur in the future, recollect that I am still your protectress, as I have been to-day. I have forced you to your promise, but for that I ask your forgiveness, because it is essential, if the mystery is ever to be solved." "Are you, too, seeking the truth?" "Yes," she responded. "But we must not talk here. The condition of our clothes is attracting attention." "I shall think always of the mysterious Edna who refuses all information," I laughed. "And I, too, shall not easily forget you--and all I owe to you. Farewell." Her soft hand grasped mine for an instant, that same cool hand that had soothed my brow. Afterwards she assisted me into the cab.