Thus, two hours later, several miles up the river, another launch containing three officers came to its destination, a solitary, thickly-wooded island that brooded under a cloak of silence where the river leaves broad Lake St. Clair. The launch crept up to a mooring post a few feet from a small, rough beach, and was tied there. Quickly, the men waded ashore and tiptoed up a winding trail that was barred from the sun by dank foliage. They soon came to a clearing where a large cabin had been built. There, one of them whispered, "Guns out!" Then the three men crossed the clearing and cautiously entered the cabin. For a moment there was silence. Then came a terrified shout, followed by the bunched thunder of a succession of pistol shots. The reverberations slowly died away, and some time later the policemen reappeared and stood outside the door. One of them, dazed, kept repeating over and over, "I wouldn't have believed it! I wouldn't have believed it!" and another nodded in wordless agreement. The third, white-faced, stared for a long time unseeingly at the cloud-flecked bowl of the sky.... But it would be best, perhaps, to tell the story as it happened. * * * * * The incredible events that shaped it began two nights before, when the larger of the two rooms in the island cabin was bathed in the bald glare of a strong floodlight that threw into sharp prominence the intent features of two men in the room, and the complicated details of the strange equipment around them. Garth Howard, the younger of the two, was holding a tiny, squawling, spitting thing, not more than three inches long, which might have seemed, at a quick glance, to have been a normal enough kitten. Closer inspection, however, would have revealed that it had a thick, smooth coat, a lithe, fully developed body and narrowed, venomous eyes--things which no week-old kitten ever possessed. It was a mature cat, but in the size of a kitten. Howard's level gray eyes were held fascinated by it. When he spoke, his words were hushed and almost reverent. "Perfect, Hagendorff!" he said. "Not a flaw!" "The reduction has not improved her temper," Hagendorff articulated precisely. His deep voice matched the rest of him. Garth Howard's clean-muscled body stood a good six feet off the floor, yet the other topped him by inches. And his face compared well with his bulky body, for his head was massive, with overhanging brows and a shaggy mop of blond hair. Athlete and weight-lifter, the two looked, but in reality they were scientist and assistant, working together for a common end. * * * * *