children being decoyed away at Hampstead. It did not convey much to me, until I reached a passage where it described small puncture wounds on their throats. An idea struck me, and I looked up.

“Well?” he said.

“It is like poor Lucy's.”

“And what do you make of it?”

“Simply that there is some cause in common. Whatever it was that injured her has injured them.” I did not quite understand his answer.

“That is true indirectly, but not directly.”

“How do you mean, Professor?” I asked. I was a little inclined to take his seriousness lightly, for, after all, four days of rest and freedom