Holk Or told them earnestly. "Even if you could get out through the electric wall, the Vestans would get you. They're thick in the jungle around here."

They silently entered the hut. Its broad open windows admitted enough of the dazzling moonslight to brighten its interior.

A dark, eager-looking young Earthman sprang up as they entered, and rushed to pump Kenniston's hand.

"Lance, you got back safely!" he exclaimed. "Thank the Lord—I've been worrying myself almost crazy about you."

"How about you, Ricky?" Kenniston asked his young brother anxiously. "You're all right?"

Ricky Kenniston nodded quickly. "Sure, I'm okay. But things haven't been so good here, Lance. The Vestans have got a half-dozen pirates who ventured outside the wall in the last few days. These creatures literally haunt the jungles around here now—I think they've been drawn here from all over the asteroid."

Ricky looked wonderingly at Gloria and the others who were entering the hut. "Lance, who are all these people? Are they prisoners of Dark too?"

"Yes, we're prisoners," Hugh Murdock told him bitterly, with a savage glance at Kenniston. "We're prisoners because your brother sacrificed us all to get back here and save your neck."

"Lance, you didn't do that?" Ricky exclaimed in distress.

"I had to, Ricky," Kenniston protested. "It meant your life if I didn't."

"Of course," Murdock agreed ironically. "What importance are we, compared to saving your young brother's life?"

Kenniston spoke slowly, to Murdock and Gloria and the others. "It wasn't merely Ricky's life at stake that made me sacrifice you all. It was more than that. I tried to tell you before, but you wouldn't listen."

enniston went across the hut and brought back the square black medicine-case of his young physician-brother. He opened it, and out of the vials and instruments inside he took a square bottle of milky fluid.

"This is what I sacrificed everything to save," Kenniston said simply.

They all stared. "What is it?" Gloria asked, puzzled.

"It's Ricky's discovery," Kenniston said. "It's a preventative and cure 

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