listening for such messages. Detecting one, a colonizing team follows it to the planet."

He tapped his cigarette delicately on the edge of an ash tray. "This method has definite advantages over sending combined colonization and exploration teams obviously. It avoids the necessity of equipping large forces for what may be decades of searching."

"Sure." Cercy's face was expressionless. "Would you tell me more about this message?"

"There isn't much more you need know. The beam is not detectable by your methods and, therefore, cannot be jammed. The message continues as long as I am alive."

arrig drew in his breath sharply, glancing at Cercy.

"If you stopped broadcasting," Cercy said casually, "our planet would never be found."

"Not until this section of space was resurveyed," the diplomat agreed.

"Very well. As a duly appointed representative of the President of the United States, I ask you to stop transmitting. We don't choose to become part of your empire."

"I'm sorry," the Ambassador said. He shrugged his shoulders easily. Cercy wondered how many times he had played this scene on how many other planets.

"There's really nothing I can do." He stood up.

"Then you won't stop?"

"I can't. I have no control over the sending, once it's activated." The diplomat turned and walked to the window. "However, I have prepared a philosophy for you. It is my duty, as your Ambassador, to ease the shock of transition as much as possible. This philosophy will make it instantly apparent that—"

As the Ambassador reached the window, Cercy's gun was out of his pocket and roaring. He squeezed six rounds in almost a single explosion, aiming at the Ambassador's head and back. Then an uncontrollable shudder ran through him.

The Ambassador was no longer there!

ercy and Darrig stared at each other. Darrig muttered something about ghosts. Then, just as suddenly, the Ambassador was back.

"You didn't think," he said, "that it would be as easy as all that, did you? We Ambassadors have, necessarily, a certain diplomatic immunity." He fingered one of the bullet holes in the wall. "In case you don't understand, let me put it this way. It is not in your power to kill me. You couldn't even understand the nature of my defense."

He looked at them, and in that moment Cercy felt the Ambassador's complete alienness.

"Good day, gentlemen," he said.

Darrig and Cercy walked silently back to the control room. Neither had really expected that the Ambassador would be killed so easily, but it had still been a shock when the slugs had failed.

"I suppose you saw it all, Malley?" Cercy asked, when he reached the control room.

The thin, balding psychiatrist nodded sadly. "Got it on film, too."

"I wonder what his philosophy is," Darrig mused, half to himself.

"It was illogical to expect it would work. No race would send an ambassador with a message like that and expect him to live through it. Unless—"

"Unless what?"

"Unless he had a pretty effective defense," the psychiatrist finished unhappily.

Cercy walked across the room and looked at the video panel. The Ambassador's suite was very special. It had been hurriedly constructed two days after he had landed and delivered his message. The suite was steel and lead lined, filled with video and movie cameras, recorders, and a variety of other things.

It was the last word in elaborate death cells.

In the screen, Cercy could see the Ambassador sitting at a table. He was typing on a little portable the Government had given him.

"Hey, Harrison!" Cercy called. "Might as well go ahead with Plan