"I did not," he replied, shortly. "It was a woman who wore some kind of loose robe, possibly a kimono. Beyond that I could swear to nothing, except that it was not Mrs. Fisher."

We fell silent for a while. What Paul Harley's thoughts may have been I know not, but my own were strange and troubled. Presently I found my voice again, and:

"I think, Harley," I said, "that I should report to you something which Miss Beverley told me this evening."

"Yes?" said he, eagerly. "I am anxious to hear anything which may be of the slightest a.s.sistance. You are no doubt wondering why I retired so abruptly to-night. My reason was this: I could see that you were full of some story which you had learned from Miss Beverley, and I was anxious to perform my tour of inspection with a perfectly unprejudiced mind."

"You mean that your suspicions rested upon an inmate of Cray's Folly?"

"Not upon any particular inmate, but I had early perceived a distinct possibility that these manifestations of which the Colonel complained might be due to the agency of someone inside the house. That this person might be no more than an accomplice of the prime mover I also recognized, of course. But what did you learn to-night, Knox?"

I repeated Val Beverley's story of the mysterious footsteps and of the cries which had twice awakened her in the night.

"Hm," muttered Harley, when I had ceased speaking. "a.s.suming her account to be true--"

"Why should you doubt it?" I interrupted, hotly.

"My dear Knox, it is my business to doubt everything until I have indisputable evidence of its truth. I say, a.s.suming her story to be true, we find ourselves face to face with the fantastic theory that some woman unknown is living secretly in Cray's Folly."

"Perhaps in one of the tower rooms," I suggested, eagerly. "Why, Harley, that would account for the Colonel's marked unwillingness to talk about this part of the house."

My sight was now becoming used to the dusk, and I saw Harley vigorously shake his head.

"No, no," he replied; "I have seen all the tower rooms. I can swear that no one inhabits them. Besides, is it feasible?"

"Then whose were the footsteps that Miss Beverley heard?"

"Obviously those of the woman who, at this present moment, so far as I know, is in the smoking-room with Colonel Menendez."

I sighed wearily.

"This is a strange business, Harley. I begin to think that the mystery is darker than I ever supposed."

We fell silent again. The weird cry of a night hawk came from somewhere in the valley, but otherwise everything within and without the great house seemed strangely still. This stillness presently imposed its influence upon me, for when I spoke again, I spoke in a low voice.

"Harley," I said, "my imagination is playing me tricks. I thought I heard the fluttering of wings at that moment."

"Fortunately, my imagination remains under control," he replied, grimly; "therefore I am in a position to inform you that you did hear the fluttering of wings. An owl has just flown into one of the trees immediately outside the window."

"Oh," said I, and uttered a sigh of relief.

"It is extremely fortunate that my imagination is so carefully trained," continued Harley; "otherwise, when the woman whose shadow I saw upon the blind to-night raised her arms in a peculiar fashion, I could not well have failed to attach undue importance to the shape of the shadow thus created."

"What was the shape of the shadow, then?"

"Remarkably like that of a bat."

He spoke the words quietly, but in that still darkness, with dawn yet a long way off, they possessed the power which belongs to certain chords in music, and to certain lines in poetry. I was chilled unaccountably, and I peopled the empty corridors of Cray's Folly with I know not what uncanny creatures; nightmare fancies conjured up from memories of haunted manors.

Such was my mood, then, when suddenly Paul Harley stood up. My eyes were growing more and more used to the darkness, and from something strained in his att.i.tude I detected the fact that he was listening intently.

He placed his cigarette on the table beside the bed and quietly crossed the room. I knew from his silent tread that he wore shoes with rubber soles. Very quietly he turned the handle and opened the door.

"What is it, Harley?" I whispered.

Dimly I saw him raise his hand. Inch by inch he opened the door. My nerves in a state of tension, I sat there watching him, when without a sound he slipped out of the room and was gone. Thereupon I arose and followed as far as the doorway.

Harley was standing immediately outside in the corridor. Seeing me, he stepped back, and: "Don't move, Knox," he said, speaking very close to my ear. "There is someone downstairs in the hall. Wait for me here."

With that he moved stealthily off, and I stood there, my heart beating with unusual rapidity, listening-listening for a challenge, a cry, a scuffle-I knew not what to expect.

Cavernous and dimly lighted, the corridor stretched away to my left. On the right it branched sharply in the direction of the gallery overlooking the hall.

The seconds pa.s.sed, but no sound rewarded my alert listening-until, very faintly, but echoing in a m.u.f.fled, church-like fashion around that peculiar building, came a slight, almost sibilant sound, which I took to be the gentle closing of a distant door.

Whilst I was still wondering if I had really heard this sound or merely imagined it:

"Who goes there?" came sharply in Harley's voice.

I heard a faint click, and knew that he had shone the light of an electric torch down into the hall.

I hesitated no longer, but ran along to join him. As I came to the head of the main staircase, however, I saw him crossing the hall below. He was making in the direction of the door which shut off the servants' quarters. Here he paused, and I saw him trying the handle. Evidently the door was locked, for he turned and swept the white ray all about the place. He tried several other doors, but found them all to be locked, for presently he came upstairs again, smiling grimly when he saw me there awaiting him.

"Did you hear it, Knox?" he said.

"A sound like the closing of a door?"

Paul Harley nodded.

"It was the closing of a door," he replied; "but before that I had distinctly heard a stair creak. Someone crossed the hall then, Knox. Yet, as you perceive for yourself, it affords no hiding-place."

His glance met and challenged mine.

"The Colonel's visitor has left him," he murmured. "Unless something quite unforeseen occurs, I shall throw up the case to-morrow."

CHAPTER XII

MORNING MISTS

The man known as Manoel awakened me in the morning. Although characteristically Spanish, he belonged to a more sanguine type than the butler and spoke much better English than Pedro. He placed upon the table beside me a tray containing a small pot of China tea, an apple, a peach, and three slices of toast.

"How soon would you like your bath, sir?" he enquired.

"In about half an hour," I replied.

"Breakfast is served at 9.30 if you wish, sir," continued Manoel, "but the ladies rarely come down. Would you prefer to breakfast in your room?"

"What is Mr. Harley doing?"

"He tells me that he does not take breakfast, sir. Colonel Don Juan Menendez will be unable to ride with you this morning, but a groom will accompany you to the heath if you wish, which is the best place for a gallop. Breakfast on the south veranda is very pleasant, sir, if you are riding first."