The man began to go through the place, watched by the boy with all eyes. He was a good-looking fellow, only his beard seemed a little too black and glossy to be natural, and the boy had an idea that it had never grown on his face.
All at once the man turned and looked at Billy.
At the same time he put out one hand, and it fell upon a dusty shelf on one side of the room.
“Turn your back a moment, boy,” he commanded.
Billy did so, and while he looked away he was certain that the stranger did something.
When again he looked around the man was standing at his ease and his face was as calm as ever.
“Look yonder,” suddenly cried the boy, pointing at the window. “There it is again.”
The stranger turned in an instant, and then looked at the street Arab.
“I see nothing at the window,” he said.
“It’s gone now. That’s the second time I saw it there.”