Produced by Sankar Viswanathan, Greg Weeks, and the Online Distributed Proofreading Team at http://www.pgdp.net Transcriber's Note: This etext was produced from Space Science Fiction July 1953. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. INFINITE INTRUDER BY ALAN E. NOURSE ILLUSTRATED BY SMITH When Roger Strang found that someone was killing his son--killing him horribly and often--he started investigating. He wasn't prepared to find the results of another investigation--this time about his own life. * * * * * It was the second time they tried that Roger Strang realized someone was trying to kill his son. The first time there had been no particular question. Accidents happen. Even in those days, with all the Base safety regulations and strict speed-way lane laws, young boys would occasionally try to gun their monowheels out of the slow lanes into the terribly swift traffic; when they did, accidents did occur. The first time, when they brought David home in the Base ambulance, shaken but unhurt, with the twisted smashed remains of his monowheel, Roger and Ann Strang had breathed weakly, and decided between themselves that the boy should be scolded within an inch of his young life. And the fact that David maintained tenaciously that he had never swerved from the slow monowheel lane didn't bother his parents a bit. They were acquainted with another small-boy frailty. Small boys, on occasion, are inclined to fib. But the second time, David was not fibbing. Roger Strang _saw_ the _accident_ the second time. He saw all the circumstances involved. And he realized, with horrible clarity, that someone, somehow, was trying to kill his son. [Illustration]