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Volume 15: The Sinister Signpost
A series of baffling thefts at a new trailer park leads the Hardy Boys into a maze of danger and deception. As they follow the clues left by a mysterious signpost, Frank and Joe find themselves up against a clever gang of criminals. With the support of their Aunt Gertrude, the brothers must use all their detective skills to unravel the mystery and bring the thieves to justice before they strike again.
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