It was the Professor who uttered the word, at the same time receding a step or two, for the stranger's glance startled him considerably.
"Who are you?" demanded the stranger, shortly.
"It does not concern you."
"Don't it? We'll see about that."
An arm shot forward. The Professor's plug fell to the ground, and the next instant a red wig was swung aloft in the moonlight.
"Ha! I thought so. You are the man I seek—"
The speaker's words were cut off suddenly.