Where were the photon-exciters? The gamma-ray bombardment equipment? Of course, even a fission bomb could do a good deal of local damage, as shown in the first atom-bombed cities during the Little Wars of the early Twentieth Century. But, unless our nuclear science was in error, it could not set off a chain reaction of the type that had destroyed the Venusian colonies. Was I in the wrong place? Alarmed, I shoved my way closer to the rocket, staring at it. It was a crude, primitive affair, of course, and it was hard for me to identify its parts. I examined it with frantic curiosity—and abruptly I found myself in peril! One of the technicians I had pushed aside was staring at me, eyes filled with suspicion. I caught his gaze and cursed myself for having acted so rashly. Desperately I strove to think of a way to allay his suspicions, but it was too late. "What are you doing?" the technician demanded. "Who are you?" I tried to conciliate him. "Captain San Requa's my name," I said, using the name on the stolen identity papers. "I am—" But I got no farther than that. My accent gave me away. "He's a spy!" roared the technician. "Help!" And a dozen ray-pistols flashed out of their holsters as the men around us were galvanized into action. I lost my head. Terrified, I grabbed for the safety belt concealed beneath my stolen tunic, touched the button that controlled my conductor screen. The screen shimmered into instant life, and not a moment too soon. Rays from the weapons pointed at me flashed from all sides, sparked against the opalescent curtain of the screen and were dissipated. I was safe—but only for an instant. For I had made my second great mistake. I was too close to the atom-rocket. My conductor screen grazed the warhead itself! Its energies surged through the unstable elements in the warhead; a warning bell sprang into clamorous life. The group around me froze in their tracks, mouths open, faces mirroring fright and disbelief—and the frightful power of the strained atoms within the warhead began to grind toward nuclear fission! There was only one thing to do, and a poor choice it was! But in a moment the warhead would explode, and of me and my mission, and the whole future of Earth, nothing would be left but a puff of