"But the man isn't a specter! He's a devil incarnate, but there's nothing supernatural about him."

Then little Rolston spoke. "I've been down below all day," he said, "and though I haven't discovered anything of Midwinter, I am certain of how he and Zorilla got here."

We all turned to him with startled faces.

"Do you remember, Sir Thomas," he said, "that, shortly after your arrival, when you were looking down upon London from one of the galleries, there was a big fair in Richmond Park?"

I remembered, and said so.

"Among the other attractions, there was a captive balloon—"

Morse brought his hand heavily down upon the table with a loud exclamation in Spanish.

"Yes, there was, but—but it was quite half a mile away and never came up anything like our height here."

"No," the boy answered, "not at that time. But do you remember how during the fog last night I told you I had seen something, or thought I had seen something, like a group of statuary falling before my bedroom window?"

Something seemed to snap in my mind. "Good heavens! And I thought it was merely a trick of the mist! Nothing was discovered?"