It was driving men to madness... they had managed to capture it, but for how long?ExcerptLundy was flying the aero-space convertible by himself. He'd been doing it for a long time. So long that the bottom half of him was dead to the toes and the top half even deader, except for two separate aches like ulcerated teeth; one in his back, one in his head.Thick pearly-grey Venusian sky went past the speeding flier in streamers of torn cloud. The rockets throbbed and pounded. Instruments jerked erratically under the swirl of magnetic currents that makes the Venusian atmosphere such a swell place for pilots to go nuts in.Jackie Smith was still out cold in the copilot's seat. From in back, beyond the closed door to the tiny inner cabin, Lundy could hear Farrell screaming and fighting.He'd been screaming a long time. Ever since the shot of avertin Lundy had given him after he was taken had begun to wear thin. Fighting the straps and screaming, a hoarse jarring sound with no sense in it.Screaming to be free, because of It.Somewhere inside of Lundy, inside the rumpled, sweat-soaked black uniform of the Tri-World Police, Special Branch, and the five-foot-six of thick springy muscle under it, there was a knot. It was a large knot, and it was very, very cold in spite of the sweltering heat in the cabin, and it had a nasty habit of yanking itself tight every few minutes, causing Lundy to jerk and sweat as though he'd been spiked.Lundy didn't like that cold tight knot in his belly. It meant he was afraid. He'd been afraid before, plenty of times, and he wasn't ashamed of it. But right now he needed all the brains and guts he had to get It back to Special headquarters at Vhia, and he didn't want to have to fight himself, too.Fear can screw things for you. It can make you weak when you need to be strong, if you're going to go on living. You, and the two other guys depending on you.Lundy hoped he could keep from getting too much afraid, and too tired-because It was sitting back there in its little strongbox in the safe, waiting for somebody to crack.Farrell was cracked wide open, of course, but he was tied down. Jackie Smith had begun to show signs before he passed out, so that Lundy had kept one hand over the anesthetic needle gun bolstered on the side of his chair. And Lundy thought, the hell of it is, you don't know when It starts to work on you. There's no set pattern, or if there is we don't know it. Maybe right now the readings I see on those dials aren't there at all . . . .Down below the torn grey clouds he could see occasional small patches of ocean. The black, still, tideless water of Venus, that covers so many secrets of the planet's past.It didn't help Lundy any. It could be right or wrong, depending on what part of the ocean it was-and there was no way to tell. He hoped nothing would happen to the motors. A guy could get awfully wet, out in the middle of that still black water.Farrell went on screaming. His throat seemed to be lined with impervium. Screaming and fighting the straps, because It was locked up and calling for help.