"So much noise it would wake a tombstone," added Chet.
Again Jack called, and with no better results.
"Let's all yell together," suggested Joe.
This was done, but no answer came back.
"Sorry, but I've got a date elsewhere," mimicked Joe. "Be back next month at three o'clock."
"That fellow is no good, and I know it," murmured Frank. "An honest man would come back and face us."
"Listen!" cried Jack, putting up his hand.
All listened with strained ears.
"Don't hear a thing—" began Chet.
"I hear it," interrupted Frank.