The Billion Dollar Ransom

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 Mystery of the Dead Mans Riddle

The Scarlet Slipper Mystery

The Pearl of Bengal #2 (Agatha: Girl of Mystery)

Mr Penguin and the Fortress of Secrets

The Hardy Boys

In 'Mystery of Smugglers Cove', the Hardy Boys discover a secret passage to an underground cave where smugglers hide their illegal goods. As they seek to unveil the mysteries, they find themselves entangled in an exciting adventure full of twists and turns.

Discover Your Child's Next Read

The Billion Dollar Ransom

Franklin W. Dixon, 1982

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 Mystery of the Dead Mans Riddle

Robert Arthur, William Arden, 1974

The Scarlet Slipper Mystery

Carolyn Keene, 1954

The Pearl of Bengal #2 (Agatha: Girl of Mystery)

Steve Stevenson, Stefano Turconi, 2010

Mr Penguin and the Fortress of Secrets

Alex T. Smith, 2018