I shall lay myself open to a charge of denseness such as even Doctor Watson would have scorned when I say that, though I thought of the matter a good deal on my way back to the school, I did not arrive at the obvious solution. Much teaching and taking of duty had dulled my wits, and the presence at Sanstead House of the Little Nugget did not even occur to me as a reason why strange Americans should be prowling in the village. We now come to the remarkable activity of White, the butler. It happened that same evening. It was not late when I started on my way back to the house, but the short January day was over, and it was very dark as I turned in at the big gate of the school and made my way up the drive. The drive at Sanstead House was a fine curving stretch of gravel, about two hundred yards in length, flanked on either side by fir trees and rhododendrons. I stepped out briskly, for it had begun to freeze. Just as I caught sight through the trees of the lights of the windows, there came to me the sound of running feet. I stopped. The noise grew louder. There seemed to be two runners, one moving with short, quick steps, the other, the one in front, taking a longer stride. I drew aside instinctively. In another moment, making a great clatter on the frozen gravel, the first of the pair passed me; and as he did so, there was a sharp crack, and something sang through the darkness like a large mosquito. The effect of the sound on the man who had been running was immediate. He stopped in his stride and dived into the bushes. His footsteps thudded faintly on the turf. The whole incident had lasted only a few seconds, and I was still standing there when I was aware of the other man approaching. He had apparently given up the pursuit, for he was walking quite slowly. He stopped within a few feet of me and I heard him swearing softly to himself. 'Who's that?' I cried sharply. The crack of the pistol had given a flick to my nerves. Mine had been a sheltered life, into which hitherto revolver-shots had not entered, and I was resenting this abrupt introduction of them. I felt jumpy and irritated. It gave me a malicious pleasure to see that I had startled the unknown dispenser of shocks quite as much as he had startled me. The movement he made as he faced towards my direction was almost a leap; and it suddenly flashed upon me that I had better at once establish my identity as a non-combatant. I appeared to have wandered inadvertently into the midst of a private quarrel, one party to which--the one standing a couple of yards from me with a loaded revolver in his hand--was evidently a man of impulse, the sort of man who would shoot first and inquire afterwards. 'I'm Mr Burns,' I said. 'I'm one of the assistant-masters. Who are you?' 'Mr Burns?' Surely that rich voice was familiar. 'White?' I said. 'Yes, sir.' 'What on earth do you think you're doing? Have you gone mad? Who was that man?'