It was nice to know that Luise liked him now--because she wouldn't after this was over. He wiped the sweat off his forehead; all of it hadn't come from physical exertion. "Putsyn here is a scientist," he said. "He worked out a machine that reverses the effects of the retro gun. He intended to go to everyone who'd been retrogressed, and in return for giving them back their memory, they'd sign over most of their property to him. "Naturally, they'd agree. They all want to return to their former lives that bad, and, of course, they aren't aware of how much money they had. He had it all his way. He could use the machine to investigate them, and take only those who were really wealthy. He'd give them a partial recovery in the machine, and when he found out who they were, give them a quick shot of a built-in retro gun, taking them back to the time they'd just entered his office. They wouldn't suspect a thing. "Those who measured up he'd sign an agreement with, and to the other poor devils he'd say that he was sorry but he couldn't help them." Putsyn was conscious now. "It's not so," he said sullenly. "He can't prove it." "I don't think he's trying to prove that," said Borgenese, still calm. "Let him talk." Luis took a deep breath. "He might have gotten away with it, but he'd hired a laboratory assistant to help him perfect the machine. She didn't like his ideas; she thought a discovery like that should be given to the public. He didn't particularly care what she thought, but now the trouble was that she could build it too, and since he couldn't patent it and still keep it secret, she was a threat to his plans." He paused. "Her name was Luise Obispo." * * * * * He didn't have to turn his head. From the corner of his eye, he could see startlement flash across her face. She'd got her name right; and it was he who had erred in choosing a name. "Putsyn hired a criminal, Dorn Starret, to get rid of her for him," he said harshly. "That was the way Starret made his living. He was an expert at it. "Starret slugged her one night on Mars. He didn't retro her at once. He loaded her on a spaceship and brought her to Earth. During the passage, he talked to her and got to like her a lot. She wasn't as developed as she is now, kind of mousy maybe, but you know how those things are--he liked her. He made love to her, but didn't get very far. "He landed in another city on Earth and left his spaceship there; he drugged her and brought her to the Shelter here and retroed her. That's what he'd been paid to do. "Then he decided to stick around. Maybe she'd change her mind after retrogression. He stayed in a Shelter just across from the one she was in. And he made a mistake. He hid the retro gun behind the screen.