On the fourth day, armed forces from the rest of the country began to arrive. They combed the city, searching for the creatures. Bullets had no effect, though. They passed right through the bodies of the Invaders, splattered off buildings and lampposts as though there had been nothing in the way. Damn Harwood, I thought, as I stood at my window and watched the fruitless attempts to drive away the Invaders. All the time, I knew, that damnable vortex was still open, and more and more of them were pouring through every second. It was funny, in a way, that the world should end this way. It was the end of the world, of course; we had no defense against them, and they burned and killed unstoppably. The streets were blockaded; we could go nowhere, see no one. Communication was impossible; telephones were no longer working, ever since the Invaders had discovered what a juicy supply of radiation the coaxial cables provided. We were walled up with ourselves, waiting for the end. As I paced my room impatiently, I thought of Laura, there with her father—her father who had, unwittingly or otherwise, brought this destruction into the world. Then I looked around at my equipment, my partially-designed force-field generators. An idea struck me. We were completely defenseless against the Invaders now. But maybe, if— I worked through the night and on into the morning, soldering and reconnecting. I had only the barest shred of a plan, and that a mostly wishful one, but I had nothing else at all to do but work. Finally morning came. Again there was the booming of guns from outside, as the army continued its attempts to drive out the Invaders. I glanced out the window and saw three of the translucent globes hovering over the charred body of a man in military uniform, and shuddered. I went back to my generator, and worked until hunger reminded me that there was no food left in the house. This was the end, then. I was nowhere near the solution of my problem, and I knew I wouldn't be able to work for long without food. I glanced outside again. The air was thick with the things; I didn't dare risk a break. So I turned back to my generator and forced myself to keep working. I did. I worked far on into the afternoon, getting more and more tired—until, sometime near nightfall, I fell asleep. I slept. Suddenly, I was awakened by the simultaneous touch of a hand on my shoulder and clap of thunder