"Your front door was open so I walked in."
I nodded. His eyes, stained with blue, rested on me.
"I have been thinking," he said. "It struck me that there was something you forgot to tell me the other day."
I nodded again.
"You began, if you remember, by asking me if I believed in miracles. That set me thinking, and as I saw your name in the paper, connected with the Blue Disease, I knew you were a miracle-monger. How did you do it?"
"I don't know. It was all due to my black cat. Tripped over it, got concussion and regained my senses with the idea that led up to the germ."
He smiled.
"A black cat," he mused. "I wonder if it's all black magic?"
"That's what Hammer suggested. I don't know what kind of magic it is."
"Of course it is magic," said Thornduck.