Related Series: The Hardy Boys Casefiles, The Hardy Boys, The Hardy Boys, Ring of Evil, Hardy Boys: Killer Mystery
The Hardy Boys: Double Danger book series by Franklin W. Dixon includes books Double Trouble (Hardy Boys: Undercover Brothers, #26; Double Danger Trilogy, #1), Double Down (Hardy Boys: Undercover Brothers, #27; Double Danger Trilogy, #2), and Double Deception. See the complete Hardy Boys: Double Danger series book list in order, box sets or omnibus editions, and companion titles.
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