He watched her start toward the house; then he swung quickly from the road into the woods. He swore savagely to himself. She had kept him too long. There was very little chance now of finding the owner of that voice. Had there ever been? What did it matter, the moment or so it had taken to get rid of Polly? The odds were all with the voice, and had been from the start. He was not only metaphorically, but literally, stabbing in the dark. What did it mean? Again he swore, and swore now through clenched teeth. He knew well enough what it meant. It meant what he knew now that shot through his cabin window had meant. It meant that he was known to some one as he should be known to no one. It meant that of two men on this island, there was room for only one; otherwise it promised disaster, exposure—the end. A strangling, horrible end—on the end of a rope.

A door of the past ajar!

Who? Who?

He was making too much noise! Rather than stalking his game, he was more likely to be stalked. He had been stalked—when that voice had cried out. He halted—listened. Nothing! But it was somewhere in here that the voice had come from. He could swear to that.

He worked forward again. Damn the trees and foliage! How could one go quietly when one had to fight one's way through? And it was soggy and wet underfoot—one's feet made squeaky, oozy noises.

He came out on the beach—a long, curving stretch of sand, glistening white in the moonlight. He was amazed that he had travelled so far. How far had he travelled? His mind, like his soul, was in a state of fury, of fear; there was upon him a frenzy, the urge of self-preservation, to kill.

A structure of some kind, extending out into the sea, loomed up a distance away over to the right. He stared at it. It was a boathouse; and its ornate, exaggerated size stamped it at once as an adjunct to the mad millionaire's mansion. But the voice had not come from the boathouse—it had come from the woods back in here behind him.

Captain Francis Newcombe retraced his steps into the woods again, but now with far greater caution than before; and presently, his revolver in his hand, he sat down upon the stump of a tree. He held his hand up close before his eyes. It was steady, without sign of tremor. That was better! He was cooler now—no, cool; not cooler—quite himself. If he could not move here in the woods without making a noise, neither could any one else. And from the moment that voice had flung its threat and jeer through the night there had been no sound in the underbrush. He had listened, straining his ears for that very thing, even while he had manoeuvred to get Polly out of the road without arousing suspicion anent himself in her mind. He was listening now. It was the only chance. True, whoever it was might have been close to the beach, or close to the road, and had already escaped, and in that case he was done in; but on the other hand, the man, if it were a man and not a devil, might very well have done what he, Captain Francis Newcombe, was doing now, remained silent and motionless, secure in the darkness. If that were so then, sooner or later, the other must make a move.

Silly? Impossible? A preposterous theory? Perhaps! But there was no alternative hope of catching the other to-night. Why hadn't he adopted this plan from the start? How sure was he after all that, covered by the noise he himself had made, the other had not got away?

The minutes passed—five, ten of them. There was no sound. The silence itself became heavy. It began to palpitate. It grew even clamorous, thundering ghastly auguries, threats and gibes in his ears. And then it began to take up a horrible sing-song refrain: "Who was it? Who was it? Who was it?"