n the control room, Cercy shouted Harrison into consciousness.

"Listen," he said, "I want you to build something, quick. Do you hear me?"

"Sure." Harrison blinked and sat up. "What's the rush?"

"I know what Darrig wanted to tell us," Cercy said. "Come on, I'll tell you what I want. And Malley, put down that hypodermic. I haven't cracked. I want you to get me a book on Greek mythology. And hurry it up."

Finding a Greek mythology isn't an easy task at two o'clock in the morning. With the aid of FBI men, Malley routed a book dealer out of bed. He got his book and hurried back.

Cercy was red-eyed and excited, and Harrison and his helpers were working away at three crazy looking rigs. Cercy snatched the book from Malley, looked up one item, and put it down.

"Great work," he said. "We're all set now. Finished, Harrison?"

"Just about." Harrison and ten helpers were screwing in the last parts. "Will you tell me what this is?"

"Me too," Malley put in.