CHAPTER V
THE STRANGE WARNING
"Open it, Jack, and see what the message is," urged Tom, as his chum stood with the scrap of damp paper held between his fingers, having allowed the sagging little toy balloon to fall at his feet.
Jack was thinking just at that moment of the other message his companion and he had found attached to the homing pigeon. But of course they could not possibly have any sort of connection!
He opened the small bit of paper. It had some writing in lead pencil. Once it had doubtless been plain enough, but the dampness must have caused it to become faint. Still, Jack could make it out without much difficulty. This was what he read aloud, so that Tom and the other pilot could hear:
"Look carefully to your planes; examine every part. There is treachery in the air!"
"That's all, fellows," said Jack, much puzzled, as he turned the paper over and over, looking for some signature.
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