Mayton Avenue way, brought in something I found rather interesting this
morning. I want you to come round and see it."

"Go right ahead and tell me about it," Quest invited.

"You know we've been shadowing Craig," the Inspector continued. "Not much
luck up till now. Fellow seems never to leave his master's side. We have
had a couple of men up there, though, and one of them brought in a
curious-looking object he picked up just outside the back of the
Professor's grounds. It's an untidy sort of neighbourhood, you know--kind
of waste ground they commenced to build over, and then the real estate man
who had it in hand, went smash."

"What is the thing?" Quest asked.

"Well, I want to see whether you agree with me," French went on. "If you
can't come round, I'll come to you."

"No necessity," Quest replied. "We've got over little difficulties of that
sort. Laura, just tack on the phototelesme," he added, holding the
receiver away for a moment. "One moment, French. There, that's right," he
added, as Laura, with deft fingers, arranged what seemed to be a
sensitised mirror to the instrument. "Now, French, hold up the article
just in front of the receiver."

French's reply was a little brusque.

"What are you getting at, Quest?" he demanded. "You are not going to
pretend that you can see from your room into this, are you?"