But only for an instant. She left my side for a moment, and from the sound that escaped her lips appeared to be struggling to open some means of egress from the place.

"Remain where you are," she said, "and I will return to you in a moment.

The way out is rather difficult, and I shall be compelled to a.s.sist you." Her voice sounded above me, as though she had somehow climbed to the roof of the place.

I heard the drawing of a bolt and the clang of iron; then she climbed down again to where I anxiously awaited her. The river flood had risen alarmingly, and was still entering rapidly.

"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 pa.s.sages 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 a.s.sisted me into the cab.

"Good-bye," she cried. Then she became lost to me.

I told the driver where to go, and sat back in the vehicle, plunged in my own thoughts. I was like a man in a dream. The mystery was most tantalising. Feeling weak, I stopped at a public-house and had some brandy. Indeed, I felt so unwell that I sat in the bar-parlour fully half an hour before resuming my drive.

Suddenly I recollected that I might gather something from the driver, and I inquired where he had taken me up.

"In Albert Road, Battersea, sir."

This surprised me, for I had no idea that I had been on the Surrey side of the river.

I explained to the man my blindness, and asked him to describe the lady who had put me into this cab.

"Well, sir," he said, "she was very pretty indeed, with grey eyes and darkish hair."

"She was good-looking--eh?"

"Yes, sir. I don't think I've ever seen a much prettier young lady."

I sighed. How tantalising it was that my poor sightless eyes had been unable to gaze upon her.

"Describe her more closely," I urged. "I'm anxious to know exactly what she's like."

"She had lovely eyes, sir. Her hair seemed a bit untidy, but it was a pretty shade of dark-brown. Her face seemed innocent-looking, like a child's. I was surprised to see her like that."

"Like what?"

"Half-drowned like. She had on a black skirt that seemed soaking wet through, and covered with mud. She looked in an awful plight, and yet her face was merry and smiling. She took another cab as soon as she parted from you, and drove after us across the Albert Bridge, and then down Oakley Street. There she stopped the cab to speak to some one."

"Who was it?" I asked eagerly.

"A woman. But I couldn't see distinctly. They were too far away, and turned down Cheyne Walk, so I didn't see 'em any more."

"You say that her clothes were very dirty?"

"Yes, worse than yours, and, great Scott! sir, they're bad enough.

You'll want to send 'em to the cleaners when you get 'ome."

What the man said was perfectly true. The slime of the river emitted a sickening stench, but it fortunately served to conceal one thing, namely, the blood-stains upon my coat.

I laughed at this remark of his, but I had no intention to enter upon explanations.

"From her appearance did my companion lead you to believe that she was a lady?"

"Oh yes, sir. By her manner you'd tell her as a lady among ten thousand."

"There was nothing noticeable about whereby I might recognise her again?

Try and recollect."

"No, sir," answered the man. "She was a very beautiful young lady, and that's all I noticed."

"You'd know her again if you saw her?"

"I should just say I would," laughed the man. "When a chap sees a woman as lovely as she is it ain't likely he'll forget her, even though he may have a wife and 'arf a dozen kids at 'ome."