“The key!” ejaculated Phelps.

“Yes; I had given Miss Harrison instructions to lock the door on the outside and take the key with her when she went to bed. She carried out every one of my injunctions to the letter, and certainly without her cooperation you would not have that paper in your coat-pocket. She departed then and the lights went out, and I was left squatting in the rhododendron-bush.

“The night was fine, but still it was a very weary vigil. Of course it has the sort of excitement about it that the sportsman feels when he lies beside the watercourse and waits for the big game. It was very long, though⁠—almost as long, Watson, as when you and I waited in that deadly room when we looked into the little problem of the Speckled Band. There was a church-clock down at Woking which struck the quarters, and I thought more than once that it had stopped. At last however about two in the morning, I suddenly heard the gentle sound of a bolt being pushed back and the creaking of a key. A moment later the servants’ door was opened, and Mr. Joseph Harrison stepped out into the moonlight.”