everything. You were going to leave so soon that there would be no time to learn more about you. I hid on the ship so I could study you and wait until I could prove to you that you needed me. Now, I can—Throon is dying and I can give you the proper words of explanation that will cause the others to bring him into the ship."

"Your real purpose—what is it?" he asked.

"To show you that men need the Varn. You want to explore the galaxy, and learn. So do the Varn. You have the ships and we have the telepathic ability that will end the communication problem. Your race and mine can succeed only if we go together."

He searched for the true, and hidden, purpose behind the Varn proposal and saw what it would have to be.

"The long-range goal—you failed to mention that ... your ultimate aim."

"I know what you are thinking. How can I prove you wrong—now?"

There was no way for the Varn to prove him wrong, nor for him to prove the treachery behind the Varn proposal. The proof would come only with time, when the Terran-Varn co-operation had transformed Terrans into a slave race.

The Varn spoke again. "You refuse to believe I am sincere?"

"I would be a naive fool to believe you."

"It will be too late to save Throon unless we act very quickly. I have told you why I am here. There is nothing more I can do to convince you but be the first to show trust. When I switch on the lights it will be within your power to kill me."

The Varn was gambling its life in a game in which he would be gambling the Plan and his race. It was a game he would end at the first sound of movement from the astrogator unit across the room....

"I have been here beside you all the time."

A furry paw brushed his face, claws flicked gently but grimly reminding along his throat.

He whirled and fired. He was too late—the Varn had already leaped silently away and the beam found only the bare floor. Then the lights came on, glaringly bright after the darkness, and he saw the Varn.

It was standing by the control board, its huge yellow eyes watching him. He brought the blaster into line with it, his finger on the firing stud. It waited, not moving or shrinking from what was coming. The translucent 

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