The question now arose how I might be able to examine the house. I sent an agent to the most impossible village I could think of, and summoned my man to it at such an hour that he could not possibly get back. To prevent any miscarriage, Dr. Watson accompanied him. The good vicar's name I took, of course, out of my Crockford. Do I make it all clear to you?”

“It is masterly,” said the inspector in an awed voice.

“There being no fear of interruption I proceeded to burgle the house. Burglary has always been an alternative profession had I cared to adopt it, and I have little doubt that I should have come to the front. Observe what I found. You see the gas-pipe along the skirting here. Very good. It rises in the angle of the wall, and there is a tap here in the corner. The pipe runs out into the strong-room, as you can see, and ends in that plaster rose in the centre of the ceiling, where it is concealed by the ornamentation. That end is wide open. At any moment by turning the outside tap the room could be flooded with gas. With door and shutter closed and the tap full on I would not give two minutes of conscious sensation to anyone shut up in that little chamber. By what devilish device he decoyed them there I do not know, but once inside the door they were at his mercy.”

The inspector examined the pipe with interest. “One of our officers mentioned the smell of gas,” said he, “but of course the window and door were open then, and the paint—or some of it—was already about. He had begun the work of painting the day before, according to his story. But what next, Mr. Holmes?”

“Well, then came an incident which was rather unexpected to myself. I was slipping through the pantry window in the early dawn when I felt a hand inside my collar, and a voice said: ‘Now, you rascal, what are you doing in there?’ When I could twist my head round I looked into the tinted spectacles of my friend and rival, Mr. Barker. It was a curious foregathering and set us both smiling. It seems that he had been engaged by Dr. Ray Ernest's family to make some investigations and had come to the same conclusion as to foul play. He had watched the house for some days and had spotted Dr. Watson as one of the obviously suspicious characters who had called there. He could hardly arrest Watson, but when he saw a man actually climbing out of the pantry window there came a limit to his restraint. Of course, I told him how matters stood and we continued the case together.”

“Why him? Why not us?”

“Because it was in my mind to put that little test which answered so admirably. I fear you would not have gone so far.”

The inspector smiled.

“Well, maybe not.