The Secret of Skull Mountain

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)

The Scarlet Slipper Mystery

Mr Penguin and the Fortress of Secrets

The Black Island - Classic Colour Edition

Mr Penguin and the Lost Treasure

The Hardy Boys

The Apemans Secret is about two brothers Joe and Frank who embark on a treacherous journey through the wilderness to solve the mystery of the Apeman, facing perilous dangers and uncovering hidden truths.

Discover Your Child's Next Read

The Secret of Skull Mountain

Franklin W. Dixon, 1948

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

The Scarlet Slipper Mystery

Carolyn Keene, 1954

Mr Penguin and the Fortress of Secrets

Alex T. Smith, 2018

The Black Island - Classic Colour Edition

Hergé, 1943

Mr Penguin and the Lost Treasure

Alex T. Smith, Alice Delarbre, 2017