The new arrivals felt little doubt that their colleague was indeed dead, nor, when they heard of the last catastrophe, and presently stood by Septimus May, could they feel the most shadowy suspicion that life might be restored to him. Sir Walter found his nerve steadied on the arrival of these men. Indeed, by comparison with other trials, the ordeal before him now seemed of no complexity. He gave a clear account of events, admitted his great error, and answered all questions without any further confusion of mind.

"I am not concerned to justify my permission in the matter of Mr. May,"

he concluded. "I deeply deplore it, and bitterly lament the result; but my reasons for granting him leave to do what he desired I am prepared to justify when the time comes. Others also heard him speak, and though he did not convince my daughter, whose intellect is keener than my own, I honestly believed him with all my heart. It seemed to me that only so could any reasonable explanation be reached. Moreover, you have to consider his own triumphant conviction and power of argument. Rightly or wrongly, he made me feel that he was not mistaken--indeed, made me share his resolute convictions. These things I am prepared to explain if need be. But that will not matter to you. Personally I am now only too sure that both Septimus May and I were mistaken. I realize that there must exist some physical causes for these terrible things, that they are of human origin, and I hope devoutly that you will be permitted by Providence to discover them, and those responsible for them. But the peril is evidently still acute. The danger remains, and I need not ask you to recognize it."

Inspector Frith answered him, and proved more human than Sir Walter expected. He was an educated man of high standing in his business.

"We'll waste no time," he said. "Perhaps it is as well you are convinced, Sir Walter, that these things have happened inside natural laws, and don't depend on beings in some unknown fourth dimension. That is your affair, and I am very sure, as you say, that you can give good reasons for what you did at a future inquiry, though the results are so shocking. Poor Peter was taken back to London last night, you tell us, according to directions. If he's in the same case as this unfortunate gentleman, then there's not much doubt about his being dead. We must begin at the beginning, though for us, naturally, Hardcastle's operations and their failure are the most interesting facts to be dealt with. You have told us everything that happened to him. But we have not heard who found him."

"My nephew, Henry Lennox."

"He found Captain May, too?"

"He did. He was the last to see him alive, and the first to see him afterwards."

"Is he here?"

"He will be here in the course of the day. He travelled to London last night with the body of Mr. Hardcastle."

"Why?"

"The doctor, Mr. Mannering, wished him to do so. He desired to have a companion."

"Have you anything further that you would care to tell us?"

"Only this, that I think Mr. Hardcastle, with whom I had a long conversation on his arrival, gave it as his opinion that it was not in the Grey Room we must look for an explanation. I believe he regarded his visit to the room itself as a comparatively unimportant part of the case. He was really more interested in the life of my son-in-law and his relations with other people. I think he regarded May's death as a matter which had been determined outside the Grey Room. But, if I may presume to advise you, this view of his is surely proved mistaken in the light of his own destruction and what has happened since. It is certain now that the cause of danger lies actually in the room itself, and equally certain that what killed my son-in-law also killed Mr. Hardcastle and, last night, killed the Reverend Septimus May."

"On the fact of it, yes," admitted Frith. "I think, after we have considered the situation now developed and visited the Grey Room, we shall agree that there, at any rate, we may begin the work that has brought us. You understand we rule out the possibility of any supernatural event, as Hardcastle, of course, did. While he very properly centred on the history of Captain May, and, from his point of view, did not expect to find the accident of the captain's death in this particular place would prove important, we shall now a.s.sume otherwise, and give the room, or somebody with access to it, the credit for this destruction of human life. We shall fasten on the room therefore. Our inquiry is fairly simple at the outset, simpler than poor Hardcastle's.

It will lie along one of two channels, and it depends entirely upon which channel we have to proceed whether the matter is going to take much time, and possibly fail of explanation at the end, or but a short time, and be swiftly cleared up. I hope the latter."

"I shall be glad if you can explain that remark," answered Sir Walter; but Mr. Frith was not prepared immediately to do so.

"Fully when the time comes, Sir Walter; but for the moment, no--not even to you. You will understand that our work must be entirely secret, and the lines on which we proceed known only to ourselves."

"That is reasonable, for you cannot tell yet whether I, who speak to you, may not be responsible for everything. At least, command me. I only hope to Heaven you are not going to discover a great crime."

"I share your hope. That is why I speak of two channels for inquiry,"

answered the detective. "Needless to say, we four men shall discuss the new light thrown upon the situation very fully. At present the majority of us are inclined to believe there is no crime, and the death of Mr.

May does not, to my mind, increase the likelihood of such a thing.

Indeed, it supports me, I should judge, in my present opinion. What that is will appear without much delay. We'll get to our quarters now, and ask to see the Grey Room later on."

"May I inquire concerning Mr. Hardcastle? I hope he had no wife or family to mourn him."

"He was a bachelor, and lived with his mother, who keeps a shop. The intention is to examine his body this morning, and submit it to certain conclusive tests. n.o.body expects much from them, but they're not going to lose half a chance. He was a great man."

"You will hear at once from London if anything transpires to help you?"

"We shall hear by noon at latest."

Sir Walter left them then, and Masters took the four to their accommodation. Their rooms were situated together in the corridor, as near the east end of it as possible. But the four were not yet of one mind, and when they met presently, and walked together in the garden for an hour, it appeared that while two of them agreed with Inspector Frith, under whom all acted, the fourth held to a contrary view, and desired to take the second of the two channels his chief had mentioned.

Thus three men believed some extraordinary concatenation of circ.u.mstances, probably mechanical in operation, was responsible for all that had happened in the Grey Room; but the fourth, a man older than Frith, and in some sort his rival for many years, held to it that the reason of these things must be sought in an active and conscious agency.

He trusted in a living cause, but felt confident that it was not a sane one. He had known a case when a madman, unsuspected of madness, had operated with extraordinary skill to destroy innocent persons and escape detection, and already he was disposed to believe that among the household of Chadlands might hide such an insane criminal.

On a similar plane, it was in his personal experience that weak-minded persons, possessed with a desire to do something out of the common, had often planned and perpetrated apparent physical phenomena, and created an appearance of supernatural visitations, only exposed after great difficulty by professional research. Along such lines, therefore, this man was prepared to operate, and he believed it might be possible that a maniac, in possession of some physical secret, would be found among the inhabitants of the manor house. He did not, however, elaborate this opinion, but kept it to himself. Indeed, the human element of jealousy, so often responsible for the frustration of the worthiest human ambitions, was not absent from the minds of the four now concerned with this problem.

Each desired to solve it, and while no rivalry existed among them, save in the case of the two older men, it was certain that the eldest of the four would not lose his hold on his own theory, or be at very vital pains to stultify it. All, however, were fully conscious of the danger before them, and Frith, from the first, directed that none was to work alone, either in the Grey Room or elsewhere.

At noon a telegram arrived for Mr. Frith from Scotland Yard. It recorded the fact that Peter Hardcastle was dead, and that examination had revealed no cause for his end. The news reached Sir Walter at once, and if ever he rejoiced in the death of a fellow-creature, it was upon this occasion. It meant unspeakable relief both for him and his daughter.

The detectives began their operations after a midday meal, and having first carefully studied the Grey Room in every visible particular, they emptied it of its contents, and placed the pictures, furniture, and statuette outside in the corridor. They asked for no a.s.sistance, and desired that none should visit the scene of their labors. The apartment, empty to the walls, they examined minutely; with the help of ladders, they investigated the outer walls on the east and south side; and they probed the chimney from above and below. They searched the adjoining room--Mary's old nursery--to satisfy themselves that no communication existed, and they drove an iron rod through the walls in various directions, only to prove they were of solid stone, eighteen inches thick within and two feet thick without. There was no apartment on the other side of the chamber. It completed the eastern angle of the house front, and behind it, inside, the corridor terminated at an eastern window parallel with the Grey Room oriel, but flat and undecorated--a modern window inserted by Sir Walter's grandfather to lighten a dark corner. Not a foot of the walls they left untested, and they examined and removed a portion of the paper upon them also. Then, taking up the carpet, they broke into the flooring and skirting boards, but discovered no indication that the grime and dust of centuries had ever been disturbed. The desiccated mummy of a rat alone rewarded their scrutiny.

It lay between great timbers under the planking--beams that supported the elaborate stucco roof of a dwelling-room below.

To the ceiling of the Grey Room they next turned their attention, fastened an electric wire to the nearest point, and, through a trap-door in the roof of the pa.s.sage, investigated the empty s.p.a.ce between the ceiling and the roof. Not an inch of the ma.s.sive oaken struts above did they fail to scrutinize, and they made experiments with smoke and water, to learn if, at any point, so much as a pin-hole existed in the face of the stucco. But it was solid, and spread evenly to a considerable depth.

They studied it, then, from inside the room, to discover nothing but the beautifully modeled surface, encrusted with successive layers of whitewash. The workmanship belonged to a time when men knew not to scamp their labors and art and craft went hand in hand. Such enthusiasms perished with the improvement of education. They died with the Guilds, and the Unions are not concerned to revive them.

The detectives had finished this examination when, at an hour in the late afternoon, Henry Lennox and Dr. Mannering returned. The authorities had been informed of the death of Septimus May, and desired that no more than the ordinary formalities should be taken, unless their representatives at Chadlands thought otherwise. But they did not. They were now convinced that no communication existed between the Grey Room and the outer world, and they declared their determination to watch in it during the coming night. As a preliminary to this course, however, they examined each piece of furniture and every picture and other object that they had removed from the room. These told them nothing, and presently they restored the chamber in every particular, re-laid and nailed the carpet, and placed each article as it had stood when they arrived. They continued to decline a.s.sistance, and made it clear that n.o.body was to approach the end of the corridor in which they worked.

Alive to the danger, but believing that, whatever its quality, four men could hardly be simultaneously destroyed, they prepared for their vigil.

Nor did they manifest any fear of what awaited them. Facts, indeed, may be stubborn things, but even facts will not upset the convictions of a lifetime. Not one of the four for an instant imagined that a supernatural explanation of the mystery existed. Their minds were open, and their wits, long trained in problems obscure and difficult, a.s.sured them that the problem was capable of solution and within the power of their wits to solve. They apprehended no discovery from the watch to be undertaken; but, at Frith's orders, they set stolidly about it, as a preliminary to the proceedings of the following day. Once proved that the murderous force was powerless against men prepared and armed against it, and the practical inquiry as to these strange deaths would be entered upon.

They came with full powers, and designed to search the house without warning on the following morning, and examine all who dwelt in it.

Sir Walter invited them to dine with him, and they did so. There were present the master of Chadlands, Dr. Mannering--who asked to spend the night there--and Henry Lennox; while Masters and Fred Caunter waited upon them. The detectives heard with interest the result of the post-mortem conducted during the morning, and related incidents in the life of Peter Hardcastle. They were all unfeignedly amazed that a man with such a record--one who had carried his life in his hand on many occasions--should have lost it thus, at noonday and without a sound of warning to his fellow-creatures. Dr. Mannering told how he had watched the medical examination, but not a.s.sisted at it. All attempts to galvanize back life failed, as the experts engaged immediately perceived they must upon viewing the corpse; and during the subsequent autopsy, when the dead man's body had been examined by chemist and microscopist, the result was barren of any pathological detail. No indication to explain his death rewarded the search. Not a clue or suspicion existed.

He was healthy in every particular, and his destruction remained, so far, inexplicable to science. Hardcastle had died in a syncope, as the other victims; that was all the most learned could declare.

Impressed by these facts, the four made ready, and Lennox observed that they neither drank during their meal nor smoked after it.

At nine o'clock they began their work of the night, but invited n.o.body to a.s.sist them, and begged that they might not be approached until daylight on the following morning.

Dr. Mannering took it upon himself earnestly to beg they would abandon the vigil. Indeed, he argued strongly against it.

"Consider, gentlemen," he said, "you are now possibly convinced in your own minds that the source of these horrible things is to be found outside the Grey Room, and not in it. I agree with you, so far. We have reached a pitch where, in my judgment, we are justified in believing that some motiveless malignity is at work. But by going into that room, are you not giving somebody another opportunity to do what has already been done? Evil performed without motive, as you know better than I can tell you, must be the work of a maniac, and there may exist in this house, unsuspected and unguessed, a servant afflicted in this awful way.

One has heard of such things."

The eldest of his listeners felt unspeakable interest in these remarks, since his own opinion inclined in the same direction. He was, however, none the less chagrined that another should thus voice his secret theory. He did not answer, but his chief replied.

"It is proved," said Frith, "that no violence overtakes those subjected to this ordeal. And I have decided that we shall not be in danger, for this reason. We shall be armed as none of the dead were. Our precautions will preclude any possibility of foul play from a material a.s.sault.

And, needless to say, we contemplate no other. We are free agents, and I should not quarrel with any among us who shirked; but duty is duty, and we have all faced dangers as great as this--probably far greater. What you say is most interesting, doctor, and I agree with you, that outside the room we must look for the explanation of these murders--if murders they are. Upon that business we shall start to-morrow. Forgive me for not going into details, because we have our personal methods.

They embrace the element of surprise, and, of course, prevent any conversation concerning what we are going to do until we have done it."

"Supposing you are all found dead to-morrow?" asked Dr. Mannering bluntly.

"Then we are all found dead to-morrow; and others will have the satisfaction of finding out why."

"You suspect somebody, yet can absolve n.o.body?"

"Exactly, Sir Walter. I said pretty much that to the pressmen, who forced themselves in this afternoon. The accursed daily Press of this country has saved the skin of more blackguards than I like to count.

Keep them and the photographers away. It ought to be criminal--their interference."

"I ordered that none was to be admitted for a moment."