Barney Chard, thirty-seven—financier, entrepreneur, occasional blackmailer, occasional con man, and very competent in all these activities—stood on a rickety wooden lake dock, squinting against the late afternoon sun, and waiting for his current business prospect to give up the pretense of being interested in trying to catch fish.

The prospect, who stood a few yards farther up the dock, rod in one hand, was named Dr. Oliver B. McAllen. He was a retired physicist, though less retired than was generally assumed. A dozen years ago he had rated as one of the country\'s top men in his line. And, while dressed like an aging tramp in what he had referred to as fishing togs, he was at the moment potentially the country\'s wealthiest citizen. There was a clandestine invention he\'d fathered which he called the McAllen Tube. The Tube was the reason Barney Chard had come to see McAllen.

Gently raising and lowering the fishing rod, and blinking out over the quiet water, Dr. McAllen looked preoccupied with disturbing speculations not connected with his sport. The man had a secrecy bug. The invention, Barney thought, had turned out to be bigger than the inventor. McAllen was afraid of the Tube, and in the forefront of his reflections must be the inescapable fact that the secret of the McAllen Tube could no longer be kept without Barney Chard\'s co-operation. Barney had evidence of its existence, and didn\'t really need the evidence. A few hints dropped here and there would have made McAllen\'s twelve years of elaborate precaution quite meaningless.

Ergo, McAllen must be pondering now, how could one persuade Mr. Chard to remain silent?

But there was a second consideration Barney had planted in the old scientist\'s mind. Mr. Chard, that knowledgeable man of the world, exuded not at all by chance the impression of great quantities of available cash. His manner, the conservatively tailored business suit, the priceless chip of a platinum watch ... and McAllen needed cash badly. He\'d been fairly wealthy himself at one time; but since he had refrained from exploiting the Tube\'s commercial possibilities, his continuing work with it was exhausting his capital. At least that could be assumed to be the reason for McAllen\'s impoverishment, which was a matter Barney had established. In months the old man would be living on beans.

Ergo again, McAllen\'s thoughts must be running, how might one not merely coax Mr. Chard into silence, but actually get him to come through with some much-needed financial support? What inducement, aside from the Tube, could be offered someone in his position?

Barney grinned inwardly as he snapped the end of his cigarette out on the amber-tinted water. The mark always sells himself, and McAllen was well along in the process. Polite silence was all that was necessary at the moment. He lit a fresh cigarette, feeling a mild curiosity about the little lake\'s location. Wisconsin, Minnesota, Michigan seemed equally probable guesses. What mattered was that half an hour ago McAllen\'s Tube had brought them both here in a wink of time from his home in California.