"Remember when I said there was something wrong with that town?"
"I remember, but—"
"Figure it out. The original life of the town was only a few months, so up to that time it had a right to be without one."
"Without one what?"
"But with a continuous population for ten years, it certainly should have had one."
"One what, damn it?"
"A graveyard."
Brooks mouth dropped open. "Say—that's right. There wasn't a tombstone anywhere around!"
Tom Brazier was grinning. "So the superintelligent aliens defeated themselves by being too meticulously careful. They destroyed the bodies of the natives they killed and tripped themselves up."
"When all they had to do to really camouflage the layout was to bury them."