The Apemans Secret

The Hardy Boys Secret Files Collection Books 1-5

Danger Overseas (Nancy Drew: Girl Detective and Hardy Boys: Undercover Brothers Super Mystery #2)

The Gross Ghost Mystery (Frank and Joe Hardy: The Clues Brothers #1)

Classic Starts®: The Adventures of Sherlock Holmes

The Mystery of the Purple Pirate

Kate on the Case

The Castle Mystery

The Hardy Boys

The Hardy Boys set out to solve the mystery of a wealthy man who vanished while sailing to his private island. The only clue is an old pirate's tale about a secret treasure and a secret panel.

Discover Your Child's Next Read

The Apemans Secret

Franklin W. Dixon, 1980

The Hardy Boys Secret Files Collection Books 1-5

Franklin W. Dixon, Scott Burroughs, 2014

Danger Overseas (Nancy Drew: Girl Detective and Hardy Boys: Undercover Brothers Super Mystery #2)

Franklin W. Dixon, Carolyn Keene, 2008

The Gross Ghost Mystery (Frank and Joe Hardy: The Clues Brothers #1)

Franklin W. Dixon, 1997

Classic Starts®: The Adventures of Sherlock Holmes

Lucy Corvino, Arthur Conan Doyle, Chris Sasaki, 2005

The Mystery of the Purple Pirate

Robert Arthur, William Arden, 1982

Kate on the Case

Hannah Peck, 2021

The Castle Mystery

Gertrude Chandler Warner, Gertrude Warner, 1993