McCarthy threw back his heavy head.
"That damn operator's been leaking!" he cried.
"So there are 'wireless'," observed Darrow. "No, your operator didn't leak. Who is he?"
"If he didn't leak, what did you say that for?"
"I'm a good guesser," replied Darrow enigmatically. "They say anything about a 'sign' being sent, and such talk?"
"You've been gettin' the dope yourself out of the air," returned McCarthy sullenly.
"Look here, my fat friend," drawled Darrow, his eyes half closing, "I'm getting nothing from anywhere except in my own gray matter. What do your messages have to say?"
"Why should I tell you?"
"Because I'm interested—and because I know who sent 'em."
"So do I," snarled McCarthy, in a gust of temper.