"Why do you say that?" asked the Shaggy Man.
"Because," exclaimed the Lord High Mayor, "we have discovered that the higher up you go, the thinner the air becomes. At the altitude now attained by your craft, the air would be so thin that it would be unbreathable."
"Anyway," said Twink with a sigh, "the Airmobile isn't there any more."
They all stared upward. The girl was right. The speck that had been the Airmobile had vanished completely.
"Wonder where it went?" said Twink.
The Lord High Mayor explained pompously. "Apparently your craft attained so great a speed that it shot off into space, beyond the power of gravity. From now on there's no telling where it will go."
"And astronomers will report that folks from earth are about to visit another world, I suppose," grinned the Shaggy Man.
"Too bad old Conjo isn't in it," grumbled Twiffle.
"The question is," said Tom, "what do we do now?"
"Right," agreed the Shaggy Man, as he turned to the Lord High Mayor and asked: "Sir, can you tell us how we can leave Hightown and proceed on our journey?"