BOTH AT ONCE
It was not long before there came a recurrence of the strange humming noise which had so disturbed the girls. It was only a few nights later that Chet sat up in bed with the joyful feeling that here at last was a chance to investigate at least one of the ghosts that haunted the homestead at Cherry Corners.
"Ferd! Teddy! Wake up! What's the matter? Are you dead?" he called to the boys.
The latter reluctantly opened their eyes and looked at him reproachfully.
"Can't you let a fellow sleep?" Teddy asked. But Chet, with no ceremony whatever, hauled him bodily out of bed and set him on his feet.
"Don't talk," he ordered. "Run as fast as you can to the roof before we miss it."
"What are you raving about?" asked Ferd, although both he and Teddy started obediently toward the attic stairs.
"If you wouldn't talk so much, you could hear it," Chet answered, pushing up a trap door that led to a small square platform on the roof. "It's the motor sound the girls heard and that scared them so."
"It is, for a fact!" cried Teddy in a joyful whisper. "And it's coming right near, fellows, too."
"It's an aeroplane all right," said Ferd, with conviction. "Nothing else ever made a noise like that."