Books like The Castle Conundrum by Franklin W. Dixon
In “The Castle Conundrum,” the Hardy Boys are called to the south of France to help restore a deserted town into a refugee‑children center. Rumors of a haunted castle and a hidden diamond stash put the project—and the Hardy Boys—into danger. Suspicions arise that sabotage is linked to the castle’s former lord, while French twin descendants aim to protect the historic structure from developers. The duo must unravel the clues to prevent catastrophe and protect the castle’s secrets.
First publish date: 2001
Genre: Mystery & Detective/Private Investigator
Authors: Franklin W. Dixon
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