There still was the floor to be looked under. The floor was made of adze-hewn puncheons, uneven and loosely laid, without being spiked to the beams. With an old spade he had found, Dexter got a purchase under one of the rude planks, and pried it up. He had eliminated all other possible places of retreat, and as he snapped on the button of his pocket-lamp and dropped to his knees, he felt with a certain sense of disquiet that something at last was due to happen.
A dank odor of forest mold came up from the hole he had made, and from the under darkness he heard the squeak and sudden scampering of a family of pack rats. But there was no other sound or movement of life.
He raised a second strip of flooring, and then, with a quick-drawn breath, he squeezed his lean body through the opening. There was no knowing what he might find under here, and as he flattened upon his chest to avoid the beams, he could not help reminding himself that quarters were a bit cramped for active maneuvering. The ground under him was littered with decaying forest stuff, and evidently had never been disturbed by rake or spade. There was barely enough space under the floor for him to move, but by wriggling along at full length, he made his way to the end of the cabin and back again. And he found nothing whatever. The mystery of the voice remained unsolved.
Emerging from the opening in the floor, he brushed the leaves and dirt from his uniform, and stood motionless for a space, a look of perplexity clouding his keen, weather-bronzed face. He had heard a sound like a whirring bell that, amazingly, had made him think of a telephone. But a telephone in service must have wires leading somewhere. He had examined every square foot of ground and walls and roof, and had found no connected instrument, nor any vestige of electric wiring in the cabin. There was no way to account for the bell. It was bewildering.
For the time being, however, he was most concerned about the woman. She was not in the cabin—that much was settled. She must have managed to get away somehow.
His glance strayed to the door, hanging partly open on its broken hinges. There remained this one possibility. She might have been standing by the wall when he battered his way into the cabin. Waiting her chance, she could have slipped behind him in the darkness as he stumbled over the threshold, and then passed out unseen through the open doorway. In which event her departing footsteps would betray her. Dexter crossed the cabin, and stepped outside.
His flash-lamp served him once more. The light scintillated upon the fresh fallen snow, awakening a sparkle of diamonds. From the darkness beyond the clearing came the trail of hobnail boots that had led him in the first place to this dismal habitation in the forest. Also the marks of his own making were clearly defined. But there were no other prints.
He rubbed his wet sleeve across his eyes, and gazed searchingly about him. And there was nothing to be seen but whited stumps, and the soft, unscuffled surface of snowy ground. The woman had not come out that direction.
There were windows in the cabin—one on each side and two in the rear—which were large enough, perhaps, to allow a small and frightened fugitive to squeeze her body through. He walked around the building, throwing the light rays back and forth as he advanced, examining the ground underfoot and each window sill as well. So he made the circuit of the cabin, and came back, hopelessly perplexed, to his starting place at the front door. The snow lay as it had fallen on the sills and under the windows, without any imprints of human making. The slayer of the two men in the cabin bunks had vanished without leaving any trace behind.
Dexter was ready to confess his utter mystification. A queer feeling of unreality gripped him, as though he suddenly discovered himself in contention with some strange, unnatural denizen of the forest, who flitted about on darksome errands without touching foot to the earth. Some one was there a few minutes ago; murder had been done; and now this some one was gone—disappeared like a shadow in a dream.