“I can only say, Lady Arabella, that you are always welcome at any time you may deign to honour my house with your presence.”
She smiled at him sweetly.
“Thank you so much. You do put one at ease. My breach of convention makes me glad rather than sorry. I feel that I can open my heart to you about anything.”
Forthwith she proceeded to tell him about Oolanga and his strange suspicions of her honesty. Caswall laughed and made her explain all the details. His final comment was enlightening.
“Let me give you a word of advice: If you have the slightest fault to find with that infernal nigger, shoot him at sight. A swelled-headed nigger, with a bee in his bonnet, is one of the worst difficulties in the world to deal with. So better make a clean job of it, and wipe him out at once!”
“But what about the law, Mr. Caswall?”
“Oh, the law doesn’t concern itself much about dead niggers. A few more or less do not matter. To my mind it’s rather a relief!”
“I’m afraid of you,” was her only comment, made with a sweet smile and in a soft voice.
“All right,” he said, “let us leave it at that. Anyhow, we shall be rid of one of them!”
“I don’t love niggers any more than you do,” she replied, “and I suppose one mustn’t be too particular where that sort of cleaning up is concerned.” Then she changed in voice and manner, and asked genially: “And now tell me, am I forgiven?”
“You are, dear lady—if there is anything to forgive.”
As he spoke, seeing that she had moved to go, he came to the door with her, and in the most natural way accompanied her downstairs. He passed through the hall with her and down the avenue. As he went back to the house, she smiled to herself.
“Well, that is all right. I don’t think the morning has been altogether thrown away.”
And she walked slowly back to Diana’s Grove.
Adam Salton followed the line of the Brow, and refreshed his memory as to the various localities. He got home to Lesser Hill just as Sir Nathaniel was beginning lunch. Mr. Salton had gone to Walsall to keep an early appointment; so he was all alone. When the meal was over—seeing in Adam’s face that he had something to speak about—he followed into the study and shut the door.
When the two men had lighted their pipes, Sir Nathaniel began.
“I have remembered an interesting fact about Diana’s Grove—there is, I have long understood, some strange mystery about that house. It may be of some interest, or it may be trivial, in such a tangled skein as we are trying to unravel.”
“Please tell me all you know’ or suspect. To begin, then, of what sort is the mystery—physical, mental, moral, historical, scientific, occult? Any kind of hint will help me.”
“Quite right. I shall try to tell you what I think; but I have not put my thoughts on the subject in sequence, so you must forgive me if due order is not observed in my narration. I suppose you have seen the house at Diana’s Grove?”
“The outside of it; but I have that in my mind’s eye, and I can fit into my memory whatever you may mention.”
“The house is very old—probably the first house of some sort that stood there was in the time of the Romans. This was probably renewed—perhaps several times at later periods. The house stands, or, rather, used to stand here when Mercia was a kingdom—I do not suppose that the basement can be later than the Norman Conquest. Some years ago, when I was President of the Mercian Archaeological Society, I went all over it very carefully. This was when it was purchased by Captain March. The house had then been done up, so as to be suitable for the bride. The basement is very strong,—almost as strong and as heavy as if it had been intended as a fortress. There are a whole series of rooms deep underground. One of them in particular struck me. The room itself is of considerable size, but the masonry is more than massive. In the middle of the room is a sunk well, built up to floor level and evidently going deep underground. There is no windlass nor any trace of there ever having been any—no rope—nothing. Now, we know that the Romans had wells of immense depth, from which the water was lifted by the ‘old rag rope’; that at Woodhull used to be nearly a thousand feet. Here, then, we have simply an enormously deep well-hole. The door of the room was massive, and was fastened with a lock nearly a foot square. It was evidently intended for some kind of protection to someone or something; but no one in those days had ever heard of anyone having been allowed even to see the room. All this is à propos of a suggestion on my part that the well-hole was a way by which the White Worm (whatever it was) went and came. At that time I would have had a search made—even excavation if necessary—at my own expense, but all suggestions were met with a prompt and explicit negative. So, of course, I took no further step in the matter. Then it died out of recollection—even of mine.”
“Do you remember, sir,” asked Adam, “what was the appearance of the room where the well-hole was? Was there furniture—in fact, any sort of thing in the room?”
“The only thing I remember was a sort of green light—very clouded, very dim—which came up from the well. Not a fixed light, but intermittent and irregular—quite unlike anything I had ever seen.”
“Do you remember how you got into the well-room? Was there a separate door from outside, or was there any interior room or passage which opened into it?”
“I think there must have been some room with a way into it. I remember going up some steep steps; they must have been worn smooth by long use or something of the kind, for I could hardly keep my feet as I went up. Once I stumbled and nearly fell into the well-hole.”
“Was there anything strange about the place—any queer smell, for instance?”
“Queer smell—yes! Like bilge or a rank swamp. It was distinctly nauseating; when I came out I felt as if I had just been going to be sick. I shall try back on my visit and see if I can recall any more of what I saw or felt.”
“Then perhaps, sir, later in the day you will tell me anything you may chance to recollect.”
“I shall be delighted, Adam. If your uncle has not returned by then, I’ll join you in the study after dinner, and we can resume this interesting chat.”
CHAPTER XVII—THE MYSTERY OF “THE GROVE”
That afternoon Adam decided to do a little exploring. As he passed through the wood outside the gate of Diana’s Grove, he thought he saw the African’s face for an instant. So he went deeper into the undergrowth, and followed along parallel to the avenue to the house. He was glad that there was no workman or servant about, for he did not care that any of Lady Arabella’s people should find him wandering about her grounds. Taking advantage of the denseness of the trees, he came close to the house and skirted round it. He was repaid for his trouble, for on the far side of the house, close to where the rocky frontage of the cliff fell away, he saw Oolanga crouched behind the irregular trunk of a great oak. The man was so intent on watching someone, or something, that he did not guard against being himself watched. This suited Adam, for he could thus make scrutiny at will.
The thick wood, though the trees were mostly of small girth, threw a heavy shadow, so that the steep declension, in front of which grew the tree behind which the African lurked, was almost in darkness. Adam drew as close as he could, and was amazed to see a patch of light on the ground before him; when he realised what it was, he was determined, more than ever to follow on his quest. The nigger had a dark lantern in his hand, and was throwing the light down the steep incline. The glare showed a series of stone steps, which ended in a low-lying heavy iron door fixed against the side of the house. All the strange things he had heard from Sir Nathaniel, and all those, little and big, which he had himself noticed, crowded into his mind in a chaotic way. Instinctively he took refuge behind a thick oak stem, and set himself down, to watch what might occur.
After a short time it became apparent that the African was trying to find out what