"You are wishing yourself back in Baker Street," he remarked.

"How did you know?" I exclaimed. "Why, Holmes, what are you doing here?"

"Business, my dear Watson, business. Moriarty is becoming troublesome again."

"But he was drowned."

"Far too clever to be drowned in that pool. Merely stranded on the edge like myself. But I had made England too hot for him. You can guess his name."

"Not the K——!"

"Watson, Watson, Moriarty was my mental equal. Now he calls himself von Kluck."

I was overwhelmed.

Just then a little group of the staff arrived. I recognised amongst them the figures of General J—— and Field-Marshal F——, and saluted.

"The spy in staff uniform is the third on your left, Sir," said Holmes casually.