Teen sleuths Frank and Joe Hardy probe a disappearance and coastal sabotage amid eerie caves in this classic adventure mystery.
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Teen sleuths Frank and Joe Hardy probe a disappearance and coastal sabotage amid eerie caves in this classic adventure mystery.
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The Secret of the Caves by Franklin W. Dixon plunges readers into another thrilling Hardy Boys adventure, packed with danger, mystery, and heart-pounding excitement. When a college friend's brother goes missing, Frank and Joe Hardy jump at the chance to help. Their investigation leads them to the rugged coastline near Rockaway, where eerie caves hold more than just echoes-they conceal secrets that could put the Hardy boys in grave danger. As they delve deeper into the mystery, the brothers face ...
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Book 1
Book 2
Book 3
Book 4
Book 6
Book 7
Book 8
The Hardy Boys - What Happened at Midnight
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The Hardy Boys, The Hidden Harbor Mystery
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Book 16
Book 17
Book 22
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Book 24
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The wailing siren mystery, (His Hardy boys mystery stories)
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The hard boys the clue in the embers
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Book 37
Book 41
Book 43
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The Mystery of the Spiral Bridge
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Book 52
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Book 62
Hide-and-Sneak
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Book 182
What's Inside
will contain mild spoilers
Sexual content
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No romantic or sexual content depicted
Violence & gore
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Gunshots, explosions, and perilous cave encounters
Profanity
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No profanity or strong language
Substance use
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No substance use depicted
LGBTQ+ Rep.
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No LGBTQ+ characters or themes
Religious content
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No religious themes present
Magic & witchcraft
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No magic or witchcraft elements
Occult / demonology
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No occult or demonology content
Political content
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National security and anti-sabotage themes
Self-harm / suicide
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No self-harm or suicide content
Abuse & suffering
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Missing persons and hostile encounters
Other
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No information found