“There was a pause then for about ten minutes, as if the person were waiting to see whether the noise had awakened me. Then I heard a gentle creaking as the window was very slowly opened. I could stand it no longer, for my nerves are not what they used to be. I sprang out of bed and flung open the shutters. A man was crouching at the window. I could see little of him, for he was gone like a flash. He was wrapped in some sort of cloak which came across the lower part of his face. One thing only I am sure of, and that is that he had some weapon in his hand. It looked to me like a long knife. I distinctly saw the gleam of it as he turned to run.”

“This is most interesting,” said Holmes. “Pray what did you do then?”