"No reason why anyone would go to the trouble," McAllen said. "The property isn't in my name. And the nearest neighbor lives across the lake. I never come here except by the Tube so I don't attract any attention." He led the way along the dock. Barney Chard followed, eyes reflectively on the back of McAllen's sunburned neck and the wisps of unclipped white hair sticking out beneath his beaked fishing cap. Barney had learned to estimate accurately the capacity for physical violence in people he dealt with. He would have offered long odds that neither Dr. McAllen nor Fredericks, the elderly colored man of all work, had the capacity. But Barney's right hand, slid idly into the pocket of his well-tailored coat, was resting on a twenty-five caliber revolver. This was, after all, a very unusual situation. The human factors in themselves were predictable. Human factors were Barney's specialty. But here they were involved with something unknown--the McAllen Tube. When it was a question of his personal safety, Barney Chard preferred to take no chances at all. From the top of the worn wooden steps leading up to the cabin, he glanced back at the lake. It occurred to him there should have been at least a suggestion of unreality about that placid body of water, and the sun low and red in the west beyond it. Not that he felt anything of the kind. But less than an hour ago they had been sitting in McAllen's home in Southern California, and beyond the olive-green window shades it had been bright daylight. "But I can't ... I really can't imagine," Dr. McAllen had just finished bumbling, his round face a study of controlled dismay on the other side of the desk, "whatever could have brought you to these ... these extraordinary conclusions, young man." Barney had smiled reassuringly, leaning back in his chair. "Well, indirectly, sir, as the pictures indicate, we might say it was your interest in fishing. You see, I happened to notice you on Mallorca last month...." * * * * * By itself, the chance encounter on the island had seemed only moderately interesting. Barney was sitting behind the wheel of an ancient automobile, near a private home in which a business negotiation of some consequence was being conducted. The business under discussion happened to be Barney's, but it would have been inexpedient for him to attend the meeting in person. Waiting for his associates to wind up the matter, he was passing time by studying an old man who was fishing from a small boat offshore, a hundred yards or so below the road. After a while the old fellow brought the boat in, appeared a few minutes later along the empty lane carrying his tackle and an apparently empty gunny sack, and trudged unheedingly past the automobile and its occupant. As he went by, Barney had a sudden sense of recognition. Then, in a flash, his mind jumped back twelve years.