Shaken and uncertain, Clara led him to a room at the head of the stairs, which, Garth found, had a second door opening into the upper hall of the front portion of the house. The room displayed a taste seldom found among servants. His examination of it from the first spurred Garth's curiosity. The bed had been occupied last night, but to all appearances for only a brief period, since the blankets and sheets were little disturbed. Some clothing and a pair of shoes lay at one side, and clothing, shoes, and hats were neatly arranged in the closet, but nowhere could he find a dressing gown or a pair of bedroom slippers. Clara, moreover, could not recall having seen the housekeeper wear any hat or clothes other than those in the closet. If McDonald's daughter had fled from the house in slippers and dressing gown it was strange she hadn't been heard of long ago. It became increasingly clear to him that the woman remained hidden in the house. It should be easy enough to find her. He would search every corner for the one whose brain, he was now convinced, held the solution of the mystery. But on the lower floor he found no trace. He paused in the lower hall, intending to ring for McDonald to guide him through the rest of his task.
All at once his hand which he had raised to the bell hesitated. He braced himself against the wall. Through the heavy atmosphere a stifled groan had reached him, followed by a difficult dragging sound. But as he sprang up the stairs he knew he hadn't heard the cause of Clara's fright, for the groan had sufficiently defined itself as having come from a man.
In the upper hall there was no light beyond the glow sifting through the stair well. It was enough to show Garth a dark form huddled at the foot of the stairs leading to the third story. He ran over and stooped.
"McDonald! What's the matter? Are you hurt?"
The silence of the house was heavier, more secretive than before.
At last, in response to Garth's efforts, a whimpering came from McDonald's throat. The heap against the wall struggled impotently to rise. Garth recalled the medicines in Taylor's bath room and started down the hall. The unintelligible whimpering increased. Garth went on, aware that the black, huddled figure crawled after him with the sublime and unreasonable courage of a wounded animal.
He snapped on the light and ran to Taylor's bath room where he poured a stimulant into a glass. As he stepped back to the bedroom he faced Taylor's body on which the light shone with peculiar reflections. They gave to the pallid face the quality of a sneer. But it was only in connection with another radical difference at the bed that that illusion arrested Garth and sent a chill racing along his nerves. For on the counterpane, as near the crooked fingers as the revolver lay, now rested a long and ugly kitchen knife.
With a graver fear the detective glanced at the door of the hall. McDonald had dragged himself that far. He raised his trembling hand, stretching it towards the bed in a gesture, it seemed to Garth, of impossible accusation. Then the crouched figure toppled and fell across the threshold while from somewheres beyond the door a high girlish laugh rippled.
Garth sprang forward and knelt by the old man, reluctant to search for what he expected to find. There it was at the back of the coat, a jagged tear whose edges were stained, showing where the knife had penetrated the shoulder. The wound didn't look deep or dangerous, and in his unconsciousness McDonald breathed regularly. So Garth hurried back to the bed and examined the knife. There was no ambiguity about the red stains on the blade. The knife, resting close to the dead hand, had wounded McDonald who had seemed to accuse the still form whose note projected the impression of having been written after death.
Garth smothered his morbid thoughts. McDonald's daughter was the living force, probably at large in this house, that he wanted to chain. If she were guilty of the earlier crime she had sufficient motive for this attempt to keep the old man silent. She could have got such a knife from the kitchen. So, for that matter, could Clara. But the eccentric had laughed. Was that merely coincidence? Garth ran across the hall and listened at her door with an increasing excitement. He heard the running of water, regularly interrupted, as if by hands being cleansed under an open faucet. He tried the door and found it unlocked. He entered, staring at the daring indifference of the old woman who stepped from the bath room, calmly drying her hands on a towel.