He carried her to the cylinder, opened the heavy cap and drew out the small hose that Sade had used to restore to youth the white rat. Quickly, he sprayed the pink liquid upon her face and body--a treatment that was to rewrite all of medical science. Her cheeks swelled again to the form of a living face and like a trick of superimposed motion picture work, before his eyes Keren's skeletal structure became covered again with firm, rounded flesh, and on her head wispy black threads appeared and extended again into a silken sable mass. To save the spark of life that remained with Johnny, Norman knew he had to get this material back to Earth now; which meant a finish fight for a space ship. "Are you strong enough now? We've got to ambush Sade." It was an effort for Keren to reorganize her forgotten coordinations which enabled her to speak. Her lips moved soundlessly as he carried her to the door and down the passage. He explained quickly how he and Dorothy had escaped. "There are guns in the tower," she managed to whisper as they entered the front room. Dorothy stood at the door with two jet rifles, peering out at the still deserted field. "I found these in their bedroom," she said, handing Norman one of the guns. "Is she all right? I thought--" Norman told her what he had done to revive Keren. "But here's what we do," he said, lowering Keren to a sofa. "Sade will see the empty cage and know there's something wrong when he comes in to land. He will probably attack the house. We've got to get back in the cage. Keren can vaccinate you," he nodded to Dorothy, allaying her hesitation. "When they land, I'll jump out and take care of as many as I can. Keren can get the rest from the tower." "There's a glass cutter in the store room," Keren said, nodding her approval of the plan. Her cheeks were white as paper but she got up and walked unsteadily from the room. "The liquid brought her back from the grave," Norman whispered to Dorothy, watching Keren walk up the hall. * * * * * Keren returned immediately, and gave Norman the glass-cutter, which was an instrument shaped like a small riveting hammer. "One promise," she asked. "Sade's mine. I'll be in the tower. You've got to save him for me." Keren took her hypodermic from her pocket and, at Norman's smile, Dorothy permitted the needle to enter her arm. "All right. Let's go." With the cutter in one hand and the rifle in the other, Norman left the house again with Dorothy running beside him.