"I understand. My own experience was nearly identical."

"Then," continued the girl, "as I unlocked my door and peeped out, feeling too frightened to venture farther in the darkness, I heard Madame's voice in the hall below."

"Crying for help?"

"No," replied the girl, a puzzled frown appearing between her brows.

"She cried out something in French. The intonation told me that it was French, although I could not detect a single word. Then I thought I heard a moan."

"And you ran down?"

"Yes. I summoned up enough courage to turn on the light in the corridor and to run down to the hall. And there she was lying just outside the door of her room."

"Was her room in darkness?"

"Yes. I turned on the light and succeeded in partly raising her, but she was too heavy for me to lift. I was still trying to revive her when Pedro opened the door of the servants' quarters. Oh," she closed her eyes wearily, "I shall never forget it."

I took her hand and pressed it rea.s.suringly.

"Your courage has been wonderful throughout," I declared, "and I hope it will remain so to the end."

She smiled, and flushed slightly, as I released her hand again.

"I must go and take a peep at Madame now," she said, "but of course I shall not disturb her if she is still sleeping."

We turned and walked slowly back to the hall, and there just entering from the courtyard was Inspector Aylesbury.

"Ah!" he exclaimed, "good morning, Mr. Knox. This is Miss Beverley, I presume?"

"Yes, Inspector," replied the girl. "I understand that you wish to speak to me?"

"I do, Miss, but I shall not detain you for many minutes."

"Very well," she said, and as she turned and retraced her steps, he followed her back into the library.

I walked out to the courtyard, and avoiding the Tudor garden and the billiard room, turned in the other direction, pa.s.sing the stables where Jim, the negro groom, saluted me very sadly, and proceeded round to the south side of the house.

Inspector Aylesbury, I perceived, had wasted no time. I counted no fewer than four men, two of them in uniform, searching the lawns and the slopes beyond, although what they were looking for I could not imagine.

Giving the library a wide berth, I walked along the second terrace, and presently came in sight of the east wing and the tower. There, apparently engaged in studying the rhododendrons, I saw Paul Harley.

He signalled to me, and, crossing the lawn, I joined him where he stood.

Without any word of greeting:

"You see, Knox," he said, speaking in the eager manner which betokened a rapidly working brain, "this is the path which the Colonel must have followed last night. Yonder is the door by which, according to his own account, he came out on a previous occasion, walking in his sleep. Do you remember?"

"I remember," I replied.

"Well, Pedro found it unlocked this morning. You see it faces practically due south, and the Colonel's bedroom is immediately above us where we stand." He stared at me queerly. "I must have pa.s.sed this door last night only a few moments before the Colonel came out, for I was just crossing the courtyard and could see you at my window at the moment when you saw poor Menendez enter the Tudor garden. He must have actually been walking around the east wing at the same time that I was walking around the west. Now, I am going to show you something, Knox, something which I have just discovered."

From his waistcoat pocket he took out a half-smoked cigarette. I stared at it uncomprehendingly.

"Of course," he continued, "the weather has been bone dry for more than a week now, and it may have lain there for a long time, but to me, Knox, to me it looks suspiciously fresh."

"What is the point?" I asked, perplexedly.

"The point is that it is a hand-made cigarette, one of the Colonel's.

Don't you recognize it?"

"Good heavens!" I said; "yes, of course it is."

He returned it to his pocket without another word.

"It may mean nothing," he murmured, "or it may mean everything. And now, Knox, we are going to escape."

"To escape?" I cried.

"Precisely. We are going to antic.i.p.ate the probable movements of our blundering Aylesbury. In short, I wish you to present me to Mr. Colin Camber."

"What?" I exclaimed, staring at him incredulously.

"I am going to ask you," he began, and then, breaking off: "Quick, Knox, run!" he said.

And thereupon, to my amazement, he set off through the rhododendron bushes in the direction of the tower!

Utterly unable to grasp the meaning of his behaviour, I followed, nevertheless, and as we rounded the corner of the tower Harley pulled up short, and:

"I am not mad," he explained rather breathlessly, "but I wanted to avoid being seen by that constable who is prowling about at the bottom of the lawn making signals in the direction of the library. Presumably he is replying to Inspector Aylesbury who wants to talk to us. I am determined to interview Camber before submitting to further official interrogation. It must be a cross-country journey, Knox. I am afraid we shall be a very muddy pair, but great issues may hang upon the success of our expedition."

He set off briskly toward a belt of shrubbery which marked the edge of the little stream. Appreciating something of his intentions, I followed his lead unquestioningly; and, scrambling through the bushes:

"This was the point at which I descended last night," he said. "You will have to wade, Knox, but the water is hardly above one's ankles."

He dropped into the brook, waded across, and began to climb up the opposite bank. I imitated his movements, and presently, having scrambled up on the farther side, we found ourselves standing on a narrow bank immediately under that summer house which Colin Camber had told me he had formerly used as a study.

"We can scarcely present ourselves at the kitchen door," murmured Harley; "therefore we must try to find a way round to the front. There is barbed wire here. Be careful."

I had now entered with zest into the business, and so the pair of us waded through rank gra.s.s which in places was waist high, and on through a perfect wilderness of weeds in which nettles dominated. Presently we came to a dry ditch, which we negotiated successfully, to find ourselves upon the high road some hundred yards to the west of the Guest House.

"I predict an unfriendly reception," I said, panting from my exertions, and surveying my friend, who was a mockery of his ordinarily spruce self.

"We must face it," he replied, grimly. "He has everything to gain by being civil to us."

We proceeded along the dusty high road, almost overarched by trees.

"Harley," I said, "this is going to be a highly unpleasant ordeal for me."

Harley stopped short, staring at me sternly.

"I know, Knox," he replied; "but I suppose you realize that a man's life is at stake."

"You mean-?"