Legacy by James H. Schmitz (good books to read for teens txt) 📕

"What's that?"

"The real hush-hush reason for Mantelish's expedition," Trigger explained, "is, of course, to scout around this whole area of space with planetary plasmoid detectors. They don't want anybody stumbling on another setup like Harvest Moon and accidentally activating another king plasmoid."

"Yes," Pilch said. "I'd heard that."

"It was Mantelish's idea," said Trigger. "Now Mantelish is very fond of that sequoia tree. He's got a big, comfortable bench right among its roots, where he likes to sit down around noon and have a little nap when he's out here."

"Oh!" said Pilch. "Repulsive's been up to his old tricks, eh?"

"Sure. He's given Mantelish very exact instructions. So they're going to find one of those setups, all right. And they won't come back with any plasmoids. But they will come back with something they don't know about."

Pilch looked at her for a moment. "You say it!"

Trigger's grin widened. "A little green woman," she said.