“That’s what he is,” spoke Sammy.
“No—see,” added Bob, “he’s stopped near the old water hole where they used to graze the cattle.”
The three boys were crowded up against a fence, and kept staring after the man and noticing every move he made. He stood still near the spot Bob had mentioned. Then he put his fingers to his lips.
The boys caught the echo of a soft birdlike call. They breathlessly watched the man’s figure as it stood outlined against the sky. Then in a minute or two there came a reply to the whistle.
“This is getting exciting,” said Frank.
“Listen,” ordered Bob.
The man they had followed replied to the last whistle. Then the boys saw another man come from some shrubbery just beyond the schoolhouse wall.
“Oh, my!” gasped Bob.
“What is it?” whispered Frank.