I slunk down the passage like a shadow, walking as if I were treading on eggs. Very softly I tried the door. To my disgust it was locked. Now the only time Bryce ever locked it was when he was at work inside, so I knew that my man was still within reach. As if to make assurance doubly sure I caught, as I stepped back, the faint gleam of a pencil of light from under the doorway.

The position as I summed it up was this:—The intruder had entered through the door and had quietly locked it behind him. That would have been the first noise I had heard. Then he had hunted about for whatever he wanted and, once it had been found, he had drawn the chair up to the table and settled down to a prolonged study of the matter. That would explain the two sounds. Now as my man had come in through the door he was almost certain to go out the same way and, in the interests of peace and quiet, the proper course to take was to sit down and wait until he decided to come out.

I can't say how long I waited there. It seemed like hours, but of course at the outside it could not have been many minutes. I would dearly have liked to smoke, but I rather fancied that the other man's nose would be sure to scent me out. Also a scrape of a match in a still house at the dead of night sounds like a bomb-explosion. So I just squatted down on my heels and cursed my man under my breath. I was in deadly fear most of the time that he would make a noise of some kind and bring the other inhabitants down about my ears. He was my meat, and I meant to eat him myself.

At length the pencil of light went out. Somebody moved stealthily across the room and the key turned softly in the lock. I balanced the gun in my hand and got ready to swing. It was pitch-dark in the hall and I could not see an inch in front of me, but I had my fingers right up against the jamb of the door and I could feel it opening. The man was breathing with a barely perceptible wheeze and, if I had not been listening for something of the kind, I might have missed it altogether. But it was quite loud enough for me to position the fellow, and the next instant I flopped out of the darkness on to him. He gave a surprised little gasp, a sort of sizzling like the air escaping out of a punctured tyre, and went down on the mat underneath me. I had taken him so completely off his guard that there was no need for me to use my gun. I got one hand on his throat in the most approved style of the garrotte and just pressed. He wriggled a little at first, but I kept up the same even pressure, and presently he went limp. I knew then that he was harmless for the next ten minutes, so I released my hold, slipped my useless Colt into my pocket, and made to stand up. But at that precise moment the electric light in the hall went on, and a silvery voice said, "Hands up, please!"

In the astonishment of the moment I shot my hands heavenwards and turned round to view the new arrival. It was just as I thought. Moira had blundered into my little surprise party, and she was doing her level best to annex all the honors for herself. She was standing with one hand on the light switch and the other held Bryce's automatic. Her face was very pale, and the hand that held the revolver wasn't quite as steady as I could have wished. She blinked a little at me—her eyes seemed blinded by the sudden radiance—and I don't think she recognised me for the moment, so much do one's ordinary clothes make the man.

It was clearly up to me to disillusion her and persuade her either to put down the revolver or hold it in a way less calculated to alarm the peaceful public.

"You'd better put down that infernal thing, Moira," I said calmly, "or you'll be doing someone damage. The mere sight of you makes me nervous, Diana."

There was a studied insult in the last word, but I think somehow she must have missed it in the excitement of the moment, for she lowered her gun and ran towards me.

"Oh, it's you!" she cried surprisedly.

"It's me," I said dourly, and I dropped my hands into a more convenient position. "In fact it's so much me that I'd be obliged if you'd keep quiet for a while and help me look after this gentleman on the floor. I want to examine him, and I don't think I'll be able to do it in comfort if you wake the rest of the family."