Frank and Joe Hardy, brothers who are high school students, help a stranger at the train station to exchange a five-dollar bill, only to find out later that it was counterfeit. Many innocent people, including Mrs. Hardy, lose money in seemingly reasonable transactions. The Secret Service and Mr. Hardy know something is happening around Bayport, but they cannot discover who or where. The Hardy Boys use their investigation skills and lots of courage in dangerous situations to discover the counterfeiting gang.
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