Randall Garrett, Brain Twister
“ O'Connor frowned. "I'm afraid that I can't be sure," he said, and it was clear from his tone that, if Dr. Thomas O'Connor wasn't sure, no one in the entire world was, had been, or ever would be. "I do have a theory, however," he said, brightening up a trifle.Malone waited patiently."He must know our limitations," Dr. O'Connor said at last. "He must be perfectly well aware that there's not a single thing we can do about him. He must know that we can neither find nor stop him. Why should he worry? He can afford to ignore us—or even bait us. We're helpless, and he knows it." ”
