As the time wore on, the silence and the darkness seemed to increase. The circle of light on the ceiling was still there, but it seemed less brilliant than at first. The green edging of the lamp-shade became like Maori greenstone rather than emerald. The sounds of the night without the house, and the starlight spreading pale lines along the edges of the window-cases, made the pall of black within more solemn and more mysterious.

We heard the clock in the corridor chiming the quarters with its silver bell till two o'clock; and then a strange feeling came over me. I could see from Miss Trelawny's movement as she looked round, that she also had some new sensation. The new detective had just looked in; we two were alone with the unconscious patient for another quarter of an hour.

My heart began to beat wildly. There was a sense of fear over me. Not for myself; my fear was impersonal. It seemed as though some new person had entered the room, and that a strong intelligence was awake close to me. Something brushed against my leg. I put my hand down hastily and touched the furry coat of Silvio. With a very faint far-away sound of a snarl he turned and scratched at me. I felt blood on my hand. I rose gently and came over to the bedside. Miss Trelawny, too, had stood up and was looking behind her, as though there was something close to her. Her eyes were wild, and her breast rose and fell as though she were fighting for air. When I touched her she did not seem to feel me; she worked her hands in front of her, as though she was fending off something.

There was not an instant to lose. I seized her in my arms and rushed over to the door, threw it open, and strode into the passage, calling loudly:

"Help! Help!"

In an instan