"Get back, Harwood. You can't have her," I said. He laughed. "Who are you to give me orders? Come here, Laura." Laura shrank back even further. I gripped the hot soldering iron tightly and sprang forward, plunging it into the Invader that hovered between me and Harwood. I stabbed again and again--and it was like stabbing air. Finally Harwood made an impatient gesture, and the Invader glowed a brilliant red for an instant. I dropped the soldering iron and clutched at my burned hand. "For the last time, Laura--will you come with me?" "No! I hate you!" she shrieked. Harwood frowned and started toward her. As he came past me, I grabbed him with my one good hand and tried to pull him back. I had thirty years on him, but my right hand was badly seared and he was no weakling even at his age. He shoved me away and sent me sprawling against the wall. I saw him grab Laura roughly. The alien hummed ominously above my head. I made a mad dash for Harwood, caught him by the throat, started to squeeze. The humming sound grew louder, and then suddenly there was a blinding wave of heat sweeping through the apartment, and I fell back, clawing at the floor. When I was able to open my eyes, a few minutes later, I dashed to the window just in time to see Harwood holding the struggling form of Laura and riding off into the night on the backs of his extra-dimensional Invaders. * * * * * I sat down heavily on the bed and stayed there for what might have been hours, recovering my strength. The Invader had given me just a glancing shock, just enough to stun me and singe my eyebrows--and Harwood had grabbed Laura. Now I _had_ to find the answer. I had to close the gateway and find some way of killing the Invaders--and get Laura out of her father's clutches. It was nearly morning by the time I shook off the last effects of my stunning and was able to think clearly again. I pulled my generator out of the closet and looked at it, wondering what needed to be done. The gateway, first of all. It was a doorway to some alien dimension, Harwood had said. All right. I'd accept that at face value. The Invaders--what were they? Pure radiation? Energy-eaters? They were intangible, immaterial, but yet very much present. Perhaps, I thought wildly, their corporeal bodies were still in whatever dimension of infraspace they came from, and merely their essences, their _elans_, had come through? Could be, I thought. And if it were true, I might have the answer. Ignoring the fierce pangs of hunger shooting through me, I got back to work and concentrated steadily. The thought of Laura was with me always--the image of her riding off in the sky with her father's arms locked tightly around her. Riding off as if kidnapped by a witch on a broomstick.