What had killed Alfern in s.p.a.ce? Could it be duplicated on Earth? What was the regularizing principle? What was the chaos underneath?

_What in h.e.l.l am I doing here?_ he asked himself. But he couldn't start that sort of thing.

"What do you figure the Amba.s.sador is?" he asked Harrison. "Is he a man?"

"Looks like one," Harrison said drowsily.

"But he doesn't act like one. I wonder if this is his true shape?"

Harrison shook his head, and lighted his pipe.

"What is there of him?" Cercy asked. "He looks like a man, but he can change into anything else. You can't attack him; he adapts. He's like water, taking the shape of any vessel he's poured into."

"You can boil water," Harrison yawned.

"Sure. Water hasn't any shape, has it? Or has it? What's basic?"

With an effort, Harrison tried to focus on Cercy's words. "Molecular pattern? The matrix?"

"Matrix," Cercy repeated, yawning himself. "Pattern. Must be something like that. A pattern is abstract, isn't it?"

"Sure. A pattern can be impressed on anything. What did I say?"

"Let's see," Cercy said. "Pattern. Matrix. Everything about the Amba.s.sador is capable of change. There must be some unifying force that retains his personality. Something that _doesn't_ change, no matter what contortions he goes through."

"Like a piece of string," Harrison murmured with his eyes closed.

"Sure. Tie it in knots, weave a rope out of it, wind it around your finger; it's still string."

"Yeah."

"But how do you attack a pattern?" Cercy asked. And why couldn't he get some sleep? To h.e.l.l with the Amba.s.sador and his hordes of colonists, he was going to close his eyes for a moment....

"Wake up, Colonel!"

Cercy pried his eyes open and looked up at Malley. Besides him, Harrison was snoring deeply. "Did you get anything?"

"Not a thing," Malley confessed. "The philosophy must've had quite an effect on him. But it didn't work all the way. Darrig knew that he _had wanted_ to kill the Amba.s.sador, and for good and sufficient reasons. Although he felt differently now, he still had the feeling that he was betraying us. On the one hand, he couldn't hurt the Amba.s.sador; on the other, he wouldn't hurt us."

"Won't he tell anything?"

"I'm afraid it's not that simple," Malley said. "You know, if you have an insurmountable obstacle that _must_ be surmounted ... and also, I think the philosophy had an injurious effect on his mind."

"What are you trying to say?" Cercy got to his feet.

"I'm sorry," Malley apologized, "there wasn't a d.a.m.ned thing I could do. Darrig fought the whole thing out in his mind, and when he couldn't fight any longer, he--retreated. I'm afraid he's hopelessly insane."

"Let's see him."

They walked down the corridor to Malley's laboratory. Darrig was relaxed on a couch, his eyes glazed and staring.

"Is there any way of curing him?" Cercy asked.

"Shock therapy, maybe." Malley was dubious. "It'll take a long time.

And he'll probably block out everything that had to do with producing this."

Cercy turned away, feeling sick. Even if Darrig could be cured, it would be too late. The aliens must have picked up the Amba.s.sador's message by now and were undoubtedly heading for Earth.

"What's this?" Cercy asked, picking up a piece of paper that lay by Darrig's hand.

"Oh, he was doodling," Malley said. "Is there anything written on it?"

Cercy read aloud: "'Upon further consideration I can see that Chaos and the Gorgon Medusa are closely related.'"

"What does that mean?" Malley asked.

"I don't know," Cercy puzzled. "He was always interested in folklore."

"Sounds schizophrenic," the psychiatrist said.

Cercy read it again. "'Upon further consideration, I can see that Chaos and the Gorgon Medusa are closely related.'" He stared at it.

"Isn't it possible," he asked Malley, "that he was trying to give us a clue? Trying to trick himself into giving and not giving at the same time?"

"It's possible," Malley agreed. "An unsuccessful compromise--But what could it mean?"

"Chaos." Cercy remembered Darrig's mentioning that word in his telephone call. "That was the original state of the Universe in Greek myth, wasn't it? The formlessness out of which everything came?"

"Something like that," Malley said. "And Medusa was one of those three sisters with the horrible faces."

Cercy stood for a moment, staring at the paper. Chaos ... Medusa ...

and the organizing principle! Of course!

"I think--" He turned and ran from the room. Malley looked at him; then loaded a hypodermic and followed.

In 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.