A TV commentator's voice was reporting developments. "Few visible signs of a tremor," he said. "As you can see, the rocket-plant personnel and the people of Medfield are making desperate attempts to evacuate. Fortunately, most of them have already left the immediate area." A few cars and trucks could still be seen speeding along the ribbonlike roads within view of the hovering television camera. "Oh--oh!" The commentator's voice broke in again. "Notice that tall stack just over the plant--see how it's starting to tremble!... It's beginning to crumble!... This must be it!" Suddenly the whole scene seemed to explode. Plant buildings collapsed like toy houses built of cards, while at the same time huge rocks and trees were uprooted as a yawning crack opened in the ground below. The three watchers in Tom's office stared in horrified dismay. But a moment later the picture on the TV screen became jerky and distorted, then faded out completely. After a brief interval, a studio announcer came on. "The relay transmitter must have been knocked out by the quake. We return you now to our regularly scheduled program, but will keep you informed as bulletins come in." "Great balls o' fire!" Chow gulped as Tom turned off the set. "I sure hope all o' those poor folks in cars got away safe!" Tom rushed to a wall shelf and pulled out a book on geology. He leafed quickly to a section dealing with known earthquake faults and the distribution of quakes. When he looked up at the others, his face was grim. "What's wrong, skipper?" Bud asked tensely. "That quake," Tom replied, "wasn't in a patterned zone any more than the Faber one was!" Chow's jaw dropped open in a comic look of dismay. "You mean this here ole earth we live on is gettin' all busted up an' twisted around inside?" "I wish I knew, Chow!" Tom paced worriedly about the office. "It just seems queer to me that both of those quakes should have destroyed vital defense factories!" On a sudden impulse, Tom snatched up the telephone. His two companions listened as he put through a call to the FBI in Washington. Within moments, a friend at the Bureau, Wes Norris, came on the line. "Look, Wes," Tom said, "is there any chance this quake that just happened at Medfield and the earlier one at Faber Electronics might have been caused by underground H-bomb blasts?" "As a matter of fact, we're checking on that very possibility," Norris replied. "In other words, sabotage. Things are pretty hot around here since that news on Medfield came in, so I can't talk much right now, Tom. But I can tell you this," Wes concluded, "we _are_ investigating, and I do mean thoroughly!" Bud and Chow were shocked when Tom reported his conversation with the FBI agent. "Brand my rattlesnake stew!" Chow exploded. "Any ornery varmint that'd cause an earthquake ought to be strung up like a hoss thief!" "I agree, Chow," Tom said. "But how do we find out for sure?"