McCarthy snatched down the telephone receiver, through which presently he spoke a message.
"What have you got to do with this?" he demanded, after he had hung up the hook.
"I want something," said Percy, "of course."
"Sure," growled McCarthy, once more back on familiar ground, and glad of it. "What is it?"
"I'll tell you when I'm sure whether I can do anything for you in this matter."
"If this fellow didn't leak, how did you know about them wireless?" demanded McCarthy again. "How do you know who's doin' this?"
Darrow smiled.
"The man who can control the juice as this man has is a scientific expert with a full scientific equipment. If he communicated at all, it would be by wireless, as that is the easiest way to cover his trail. I remembered your telephone message from the fanatic about sending a 'sign'. Immediately after, the Atlas Building experienced on a small scale what next day the city experienced on a larger scale. It was legitimate inference to connect one with the other. Of course, if our telephone friend was the man who had brought these things about, he had done it to force you to do what he demanded. But he would lose the effect of his lesson unless you understood his connection with the matter. Hence, I concluded that you must have received messages—by wireless—and that they must have repeated the warning as to a 'sign' being sent. It was very simple."
"You're smart, all right," conceded McCarthy.
After a moment the wireless operator came in.