"We were keeping watch," I replied.

Inspector Aylesbury turned to me ponderously, raising a fat hand. "One moment, Mr. Knox, one moment," he protested. "The evidence of one witness at a time."

"We were keeping watch," said Harley, deliberately echoing my words.

"Why?"

"More or less we were here for that purpose. You see, on the night of the full moon, according to Colonel Menendez, Obeah people become particularly active."

"Why on the night of the full moon?"

"This I cannot tell you."

"Oh, I see. You were keeping watch. Where were you keeping watch?"

"In my room."

"In which part of the house is your room?"

"Northeast. It overlooks the Tudor garden."

"At what time did you retire?"

"About half-past ten."

"Did you leave the Colonel well?"

"No, he had been unwell all day. He had remained in his room."

"Had he asked you to sit up?"

"Not at all; our vigil was quite voluntary."

"Very well, then, you were in your room when the shot was fired?"

"On the contrary, I was on the path in front of the house."

"Oh, I see. The front door was open, then?"

"Not at all. Pedro had locked up for the night."

"And locked you out?"

"No; I descended from my window by means of a ladder which I had brought with me for the purpose."

"With a ladder? That's rather extraordinary, Mr Harley."

"It is extraordinary. I have strange habits."

Inspector Aylesbury cleared his throat again and looked frowningly across at my friend.

"What part of the grounds were you in when the shot was fired?" he demanded.

"Halfway along the north side."

"What were you doing?"

"I was running."

"Running?"

"You see, Inspector, I regarded it as my duty to patrol the grounds of the house at nightfall, since, for all I knew to the contrary, some of the servants might be responsible for the attempts of which the Colonel complained. I had descended from the window of my room, had pa.s.sed entirely around the house east to west, and had returned to my starting-point when Mr. Knox, who was looking out of the window, observed Colonel Menendez entering the Tudor garden."

"Oh. Colonel Menendez was not visible to you?"

"Not from my position below, but being informed by my friend, who was hurriedly descending the ladder, that the Colonel had entered the garden, I set off running to intercept him."

"Why?"

"He had acquired a habit of walking in his sleep, and I presumed that he was doing so on this occasion."

"Oh, I see. So being told by the gentleman at the window that Colonel Menendez was in the garden, you started to run toward him. While you were running you heard a shot?"

"I did."

"Where do you think it came from?"

"Nothing is more difficult to judge, Inspector, especially when one is near to a large building surrounded by trees."

"Nevertheless," said the Inspector, again raising his finger and frowning at Harley, "you cannot tell me that you formed no impression on the point. For instance, was it near, or a long way off?"

"It was fairly near."

"Ten yards, twenty yards, a hundred yards, a mile?"

"Within a hundred yards. I cannot be more exact."

"Within a hundred yards, and you have no idea from which direction the shot was fired?"

"From the sound I could form none."

"Oh, I see. And what did you do?"

"I ran on and down into the sunken garden. I saw Colonel Menendez lying upon his face near the sun-dial. He was moving convulsively. Running up to him, I that he had been shot through the head."

"What steps did you take?"

"My friend, Mr. Knox, had joined me, and I sent him for a.s.sistance."