“Yes, to talk to you. Are all the facts related by you quite correct?”
“Absolutely so.”
“Well, in that case, I can, perhaps, give you some information.”
“Very well; proceed.”
“No, not yet. First, I must be sure that the facts are exactly as you have related them.”
“I have given you my word. What further proof do you want?”
“I must remain alone in this room.”
“I do not understand,” I said, with surprise.
“It’s an idea that occurred to me when reading your article. Certain details established an extraordinary coincidence with another case that came under my notice. If I am mistaken, I shall say nothing more. And the only means of ascertaining the truth is by my remaining in the room alone.”
What was at the bottom of this proposition? Later, I recalled that the man was exceedingly nervous; but, at the same time, although somewhat astonished, I found nothing particularly abnormal about the man or the request he had made. Moreover, my curiosity was aroused; so I replied: