Herbie answered at once. "I know the girl. She's his cousin. There is no love between them. Susan Calvin stood up and held Herbie's cold, heavy hand in both hers. "Thank you, Herbie,' she whispered urgently. 'Don't tell anyone about this. Let it be our secret. And thank you again. She left the room and Herbie turned slowly to another novel. There was no one to read his thoughts. Milton Ashe was tired. Tve been working for a week, without much sleep. How long must we go on like this? Bogert looked at his smooth, white hands. "I'm nearly there. It's Lanning who's causing the delay. He's too old and won't use the new, more powerful, mathematical tools." "Why not ask Herbie? He knows everything about mathe- matics, although he doesn't like it. Didn't Calvin tell you?' "No. She hasn't told us about this. Why has she told you?' Bogert asked crossly. "Well, I've been talking to the old girl a lot." Ashe frowned. "Have you noticed that she's been peculiar recently? Bogert laughed unkindly. "She's using perfume, if that's what you mean "Yes. But there's something else. She's happy as if she got a secret. Bogert laughed again. "Maybe she's in love." Ashe closed his eyes. "You're crazy, Bogert. You go and talk to Herbie. I want to stay here and sleep. Herbie listened carefully to Peter Bogert's explanation of the