“Then suddenly I thought I knew what it was. The east entrance and the circular staircase were always used by Arnold when he was out late, and sometimes, when he forgot his key, he would rap and I would go down and let him in. I thought he had come back to see me—I didn’t think about the time, for his hours were always erratic. But I was afraid I was too weak to get down the stairs. “The knocking kept up, and just as I was about to call Liddy, she ran through the room and out into the hall. I got up then, feeling weak and dizzy, and put on my dressing-gown. If it was Arnold, I knew I must see him. “It was very dark everywhere, but, of course, I knew my way. I felt along for the stair-rail, and went down as quickly as I could. The knocking had stopped, and I was afraid I was too late. I got to the foot of the staircase and over to the door on to the east veranda. I had never thought of anything but that it was Arnold, until I reached the door. It was unlocked and opened about an inch. Everything was black: it was perfectly dark outside. I felt very queer and shaky. Then I thought perhaps Arnold had used his key; he did—strange things sometimes, and I turned around. Just as I reached the foot of the staircase I thought I heard some one coming. My nerves were going anyhow, there in the dark, and I could scarcely stand. I got up as far as the third or fourth step; then I felt that some one was coming toward me on the staircase. The next instant a hand met mine on the stair-rail. Some one brushed past me, and I screamed. Then I must have fainted.” That was Louise’s story. There could be no doubt of its truth, and the thing that made it inexpressibly awful to me was that the poor girl had crept down to answer the summons of a brother who would never need her kindly offices again. Twice now, without apparent cause, some one had entered the house by means of the east entrance: had apparently gone his way unhindered through the house, and gone out again as he had entered. Had this unknown visitor been there a third time, the night Arnold Armstrong was murdered? Or a fourth, the time Mr. Jamieson had locked some one in the clothes chute? Sleep was impossible, I think, for any of us. We dispersed finally to bathe and dress, leaving Louise little the worse for her experience. But I determined that before the day was over she must know the true state of affairs. Another decision I made, and I put it into execution immediately after breakfast. I had one of the unused bedrooms in the east wing, back along the small corridor, prepared for occupancy, and from that time on, Alex, the gardener, slept there. One man in that barn of a house was an absurdity, with things happening all the time, and I must say that Alex was as unobjectionable as any one could possibly have been.