"Never mind about the butter," he said quickly. "I guess I won't buy any after all. Just give me back my twenty dollar bill, and I'll get along."
"Oh, no, you won't!" exclaimed Harry, as he slipped around some barrels. Quickly running to the front door, the country boy locked it, and stood in front of it.
"Hurry! Give me my money back, I tell you!" cried the man to George, who stood near the cash drawer, not knowing what to do.
"Don't you give it to him!" advised Frank, stepping out. "Lock the back door, Bert," he called.
"I have!" cried the older Bobbsey boy.
The man started to run behind the counter, to find a way out, but he was too late. Bert had locked the door, and taken out the key.
"Let me out of here!" cried the stranger. "Let me out!"
Bert and Harry were somewhat frightened, but Frank was brave.
"You don't get out of here until you pay back the twenty dollars you cheated out of Mr. Mason," he said.
"I don't know anything about any Mr. Mason!" the stranger said. "I want my twenty dollar bill back, I won't need any butter to-day!"