Quietly the three boys went into the store through the rear entrance. No one up front could see them because of the piles of boxes and barrels in front of the counters.
"Well, what can I do for you to-day?" the three heard George Smith ask the stranger.
"I want two pounds of the best butter," was the man's answer. "And I suppose you can change a twenty dollar bill, can't you?"
"Oh, yes," said George. "We've got that much change."
"You were sure of that?" asked the man, glancing around the store nervously.
"Yes, sir, we always keep plenty of change on hand."
"Very well then, go and weigh out the butter and be sure and give me good weight."
"We always give full weight, sir," answered George.
Bert and the others could hear, but could not see George as he weighed out the butter. Then Frank whispered:
"I want to get near enough so I can see what kind of a twenty dollar bill that man gives this boy. Maybe it will be no good, just as he fooled me."