"Odd." He reached down to grasp a still twitching foreleg, stretched the body out with a sudden jerk.

It was a giant of its species, a male, larger than any he had seen. But a second look showed him those ribs starting through mangy fur in visible hoops, the skin tight over the skull, far too tight. The water-cat had been close to death by starvation; its attack on the men probably had been sparked by sheer desperation. A starving carnivore in a land lacking the normal sounds of small birds and animal life, in a valley used as a trap.

"No way out and no food." Vye fitted one thought to another out loud.

"Yes. Pin the enemy up, let them finish off one another."

"But why?" Vye demanded.

"Least trouble that way."

"There are plenty of water-cats down on the plains. All of them couldn't be herded up here to finish each other off; it would take years—centuries."

"This one's capture may have been only incidental, or done for the purpose of keeping some type of machinery in working order," Hume replied. "I don't believe this was arranged just to dispose of water-cats."

"Suppose this was started a long time ago, and those who did it are gone, so now it goes on working without any real intelligence behind it. That could be the answer, couldn't it?"

"Some process triggers into action when a ship sets down on this portion of Jumala, maybe when one planet's under certain conditions only? Yes, that makes sense. Only why wasn't the first Patrol explorer flaming in here caught? And the survey team—we were here for months, cataloguing, mapping, not a whisper of any such trouble."