An hour to daybreak! Passion, unchecked and unrestrained, was stamped on Captain Francis Newcombe's face as he dressed now with savage, ferocious haste. He swore and snarled, making low venomous sounds in the fury that possessed him. There was no longer room for the fear that last night, here in his rooms, had gnawed at his soul itself—the fear of the unknown; there was no longer room for fear in any sense, whether born of the intangible, or whether it knew its source in man, or God, or devil—there was only murder, that alone, in his heart.
The blows were coming nearer and nearer home. Too near! And his efforts to strike one in return had resulted in little to boast about so far! Disaster, ruin, that dangling gibbet chain, were inevitable if this went on. He had been too cautious perhaps! Well, that was ended now! He swore again—bitter, sacrilegious in his rage. The luck had been running against him. Even an old fool had tricked him—even a maniac, a cracked-brained idiot, and one almost in his dotage besides, had tricked him! Last night after he had read that infernal message at the hut he had made no effort to uncover the madman's horde—he had lain there waiting. Hours of waiting, patient waiting—listening—his revolver in his hand—the one chance that the unknown might not have gone away, might have lingered, hidden in the foliage, to gloat—and die. He had waited in vain. To-night he had gone back to the hut only to find after hours of search that the old madman's money, wherever else it might be, was not there. And then he had returned here—and again the unknown had struck swiftly, viciously, cunningly.
When, where, how would the next blow fall?—unless he could now strike the quicker, and strike surely! How much farther was it to the abyss of exposure? To-night he had stood perilously close to its edge, hadn't he? If he had not been able to pull the wool over Polly's eyes with the specious explanation that it was old Marlin who had telephoned, he would—
He stood suddenly motionless, tense, with his coat half on, his working lips drawn for the moment tight together. Had it been, after all, merely a specious explanation? Was he so sure that it wasn't old Marlin, after all, who had telephoned? The old madman was cunning; and, granting that fact as a premise, his act last night in pretending to go to his money in the hut must have been prompted by suspicion of some sort. The money had never been in that hut. The bit of flooring that was loose was flush with the ground beneath, and the ground had never been disturbed—and this was true of everywhere else in the hut. The old maniac, then, was suspicious that he was being followed by somebody, and had set a false trail. Of whom would he be suspicious? The question answered itself. The newcomers on the island, of course. And, being suspicious of them, he would want to drive them away. To frighten Polly into the belief that her mother was dead might very easily appeal to an insane brain, and even to one that wasn't, as a very clever and effective means of accomplishing this end surreptitiously. Polly might very logically be expected in her grief to wish to bring her visit here to an end, even if she did not, indeed, insist on returning to England at once—and the result would be that all who had come here, Locke, Runnells and himself, would naturally leave with her. Why not? The madman was certainly cunning enough; he could have telephoned—and the motive was there.
No! With an angry, self-contemptuous snarl, Captain Francis Newcombe jerked on his coat. Was he trying to qualify for an insane asylum himself? The old maniac could have done this to-night, otherwise the explanation made to Polly would have been merely an absurdity; but old Marlin had not been on the liner and could not have fired that shot through the cabin window—nor could the old man have known, as instanced by that voice in the woods, that he, Newcombe, was Shadow Varne—or known anything of the murder of Sir Harris Greaves. The man who had telephoned to-night—making the fourth mysterious blow that had been struck—was the man who had showed his hand on those three former occasions. This was so blatantly obvious that to have allowed his brain to shoot off at a tangent so idiotic but increased his anger now.
He sneered at himself as he finished dressing. There was only one man on the island who could be made to fit into each and every one of the four niches. Runnells! Runnells had been on board ship, even though at the time Runnells had apparently been asleep; Runnells was in a position to know, and to know what now appeared to be certainly too much, about Shadow Varne; and Runnells, though the man could prove nothing, was, more than any one else, in a position to entertain suspicions in reference to the murder of the baronet who meddled so gratuitously with the affairs of others.
Captain Francis Newcombe slipped a flashlight and a revolver into his pocket, and made for the door of his room. Quite so! All this was nothing new—no new angle—he had mulled this over a hundred times before. But up to now he had held his hand—and for two very good reasons. In the first place, he had not been able to bring himself to believe that it was Runnells, for he could not see where Runnells would profit by any such game; and, secondly, as he had already argued with himself, should it not prove to be Runnells, he almost inevitably disclosed his own hand and his real purpose in coming here to Manwa Island, and it would in that case make a partner of Runnells—and partners shared in the profits! But the time for hesitation on any such score as that was gone now; not only because the ice he was treading on, already thin, had nearly broken through to-night, and the promise of imminent and final disaster was forcing his hand, but because, in respect of Runnells, the absence of apparent motive—Runnells would be made to explain that!—counted for nothing now in view of the fact that he, Newcombe, had more to go on to-night than he had had before. Not only was Runnells one who fitted into the role of the "unknown" on each of the four occasions, but Runnells, as though to clear the matter of all doubt, knew what surely no one else on the island could possibly know—that Mrs. Wickes actually was dead. He, Newcombe, had himself to blame for that, and it appeared now that he had trusted Runnells too far; but somebody had had to bury the old hag. Not Captain Francis Newcombe! To have left her in the status of a pauper for the authorities, or the Mission Boards, or any of that ilk to have taken care of, and in view of the fact that it must have been known amongst her neighbours that she had for a long time received money from somewhere, talk, comment, investigation, official this and official that would have been invited. It might have amounted to nothing—but if a rock that is held in one's hand is not thrown into the calm waters of a pool the placid surface is not disturbed! He had delegated Runnells to interview the undertaker and arrange for the quiet and unostentatious disposal of Mrs. Wickes' mortal remains. Runnells, for the time being, did very well as a nephew of the deceased, who, though in neither close nor loving touch with his somewhat questionable relation, at least recognised the family tie to the extent of paying for her very modest and unpretentious obsequies.
Captain Francis Newcombe crept quietly along the hall now. Runnells' room, thanks to the hospitable thoughtfulness of Miss Marlin, in order that the "man" might be nearer at hand and therefore the better able to serve his "master," was not in the servants' quarters, but was at the extreme end of the hall here just at the head of the stairs. Captain Francis Newcombe's hand felt along the wall to guide him in the darkness. He had no desire to stumble over anything and arouse anybody; Locke, or Dora Marlin, for instance—and he had not forgotten that Polly was probably lying wide awake. The only one to be aroused was Runnells—and that very quietly. Runnells was a professional criminal, not a particularly clever one, but possessed, where a question of self-preservation was concerned, of a certain low cunning born of his hazardous career, a cunning that was not to be ignored. Cornered here in his room, for instance, Runnells, though quite well aware that he, Captain Francis Newcombe, would have no more hesitation about putting an end to him than an end to an obnoxious fly, would be equally well aware that here in the house he was possessed of a defence that rendered him invulnerable because no threat could be put into execution in silence, and that a cry, a shout, and, if necessary, to those who came to his succour, a confession of his own past misdeeds in order to prove his alliance with, and implicate his "master" in criminal intrigue, would protect him—for the moment—utterly.
But he, Captain Francis Newcombe, had no intention of making any such unpardonable misplay as that! Runnells would never look down the barrel of a revolver with a confidence born of the fact that the trigger dared not be pulled; Runnells would never feel a grip upon his throat and still be able to defy the clutching fingers because he knew they feared the cry, the gasp, the noise of strangulation. It would not be in Runnells' room that the man would lay bare his soul through fear to-night! Runnells would be played as a fish is played!
Captain Francis Newcombe was halfway along the hall now. His mind, despite the fury that from smouldering rage had broken into flaming heat, was logical, measured, precise. That telephone message could have come from nowhere else but from the boathouse. That was self-evident. If Runnells, then, was at the bottom of this, the question now was whether Runnells had got back to his room yet or not? And, if he were back, how long he had been back?—the man must be allowed to undress and get into bed. To discover Runnells fully dressed at this hour was to force the issue then and there in Runnells' room; for Runnells, caught like that, while he might be voluble with explanations, would of necessity at the same time be thrown instantly upon his guard, and would not be fool enough to be enticed into any trap, no matter how apparently genuine the pretence of accepting his explanations might be made to appear.
Captain Francis Newcombe was at the door now listening. Runnells would have had time by now to have got to bed; certainly there was no sound from within, and— He drew back from the door suddenly, but as silently as a shadow. There was no sound from within, but some one was creeping, though with every attempt at silence, up the staircase. Captain Francis Newcombe retreated still a little farther back along the hall, and, with body hugged now close against the wall, waited in the darkness. He could see nothing—not even across the hall; and, therefore, he was quite secure from being observed himself, but his hand, in............