Swiftly I turned--to see the door slowly opening; to see, low down upon the bare floor--for I had removed the carpet from that corner of the room--a ghastly, contorted face, held sideways with one ear almost touching the ground, and with the lower lip and the chin drawn up as though they were of rubber, almost to the tip of the nose! The eyes glared up balefully into mine, the hair hung a dishevelled mass about the face, and I had a glimpse of one bare shoulder pressed upon the floor. Wider and wider opened the door; and further into the room crept the horrible apparition.... The light gleamed equally upon the hideous, contorted face and upon the rounded shoulders and slim, white arms, on one of which a heavy gold Oriental bangle was clasped. It was a woman! In a flash of inspiration--at sight of the bangle--my doubts were resolved; _I understood_. Leaning across the table, I extinguished the lamp ... in the same instant that Major Dale, uttering an inarticulate, choking cry, sprang to his feet and toppled forward, senseless, upon the floor! The study became plunged in darkness, but into the long corridor, beyond the open door, poured the cold illumination of the moon. Framed in the portal, uprose a slim figure, seeming like a black silhouette upon a silvern background, or a wondrous statue in ebony. Elfin, dishevelled locks crowned the head; the pose of the form was as that of a startled dryad or a young Bacchante poised for a joyous leap.... Thus, for an instant, like some exquisite dream of Phidias visualised, the figure stood ... then had fled away down the corridor and was gone! VI Close upon a month had elapsed. Major Dale and I sat in my study in London. "Young Aubrey Wales has gone abroad," I said. "He's ashamed to show up again, I suppose." "H'm!" growled the Major--"I've got nothing to crow about, myself, by the Lord Harry! There's courage and courage, sir! I've led more than one bayonet attack, but I'd never qualify for the D.S.O. as a ghost-hunter!--never, by Gad!--never!" He reached out for the decanter; then withdrew his hand. "Doctor's orders," he muttered. "Discipline must be maintained!" "It was the sudden excitement which precipitated the seizure," I said, glancing at the altered face of my old friend. "I was wrong to expose you to it; but of course I did not know that the doctor had warned you." "And now," said the Major, sighing loudly as he filled his tumbler with plain soda-water--"what have you to tell me?" "In the first place--have you definitely decided to leave Low Fennel, for good?" "Certainly--not a doubt on the point! We're leasing a flat in town here whilst we look around." "Good! Because I very much doubt if the place could ever be rendered tenable...." "Then it's really haunted?" "Undoubtedly." "By what, Addison? Tell me that!--by what?" "By a grey vapour." Major Dale's eyes began to protrude, and:--