Quickly as I shot to the ladder she was there before me, a dim, wavering white shape, waiting. I paused, holding to a rung of the ladder with one hand. She came closer, walking with the airy grace I had noted before, and my heart pounded against my ribs as she raised one long, slim arm towards me. The hand dropped gently on my shoulder, pressed it as though in token of friendship. Perhaps, I thought quickly, this was, with her, a sign of greeting. I lifted my own arm and returned the salutation, if salutation it were, aware of a strange rising and falling sound, as of a distant humming, in my ears. The sound ceased suddenly, on a rising note, as though of inquiry, and it dawned on me that I had heard the speech of this strange creature. Before I could think of a course of action, my aching lungs reminded me of the need of air, and I released my hold on the ladder and let my body rise to the surface. * * * * * As my head broke the water, a hand, cold and strong as steel, closed around my ankle. I looked down. The girl was watching me, and there was no smile on her face now. "All right!" I shouted across the pool to Mercer, who was watching anxiously. Then, filling my lungs with air again, I pulled myself, by means of the ladder, to the bottom of the pool. The restraining hand was removed instantly. The strange creature thrust her face close to mine as my feet touched bottom, and for the first time I saw her features distinctly. She was beautiful, but in a weird, unearthly sort of way. As I had already noticed, her eyes were of unusual size, and I saw now that they were an intense shade of blue, with a pupil of extraordinary proportion. Her nose was well shaped, but the nostrils were slightly flattened, and the orifices were rather more elongated than I had ever seen before. The mouth was utterly fascinating, and her teeth, revealed by her engaging smile, were as perfect as it would be possible to imagine. The great mane of hair which enveloped her was, as I have said, tawny in hue, and almost translucent, like the stems of some seaweeds I have seen. And as she raised one slim white hand to brush back some wisps that floated by her face, I saw distinctly the webs between her fingers. They were barely noticeable, for they were as transparent as the fins of a fish, but they were there, extending nearly to the last joint of each finger. * * * * * As her face came close to my own, I became aware of the humming, crooning sound I had heard before, louder this time. I could see, from the movement of her throat, that I had been correct in assuming that she was attempting to speak with me. I smiled back at her and shook my head. She seemed to understand, for the sound ceased, and she studied me with a little thoughtful frown, as though trying to figure out some other method of communication.