Authors: Franklin W. Dixon, Alex Brown, Annabeth Albert, Nancy Jooyoun Kim, Michael Frost
Related Series: The Hardy Boys Casefiles, The Hardy Boys, The Hardy Boys, Ring of Evil, Hardy Boys: Killer Mystery
The Hardy Boys: Undercover Brothers book series by multiple authors includes books Extreme Danger, Running on Fumes (Hardy Boys: Undercover Brothers, #2), Boardwalk Bust, and several more. See the complete Hardy Boys: Undercover Brothers series book list in order, box sets or omnibus editions, and companion titles.
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