The Billion Dollar Ransom

DEAD SEASON

The Twin Dilemma

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

The Mystery of the Dead Mans Riddle

Mr Penguin and the Fortress of Secrets

The Smugglers

The Mystery of the Singing Ghost

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

DEAD SEASON

Franklin W. Dixon, 1990

The Twin Dilemma

Franklin W. Dixon, Carolyn Keene, 1993

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

Franklin W. Dixon, Carolyn Keene, 2008

The Mystery of the Dead Mans Riddle

Robert Arthur, William Arden, 1974

Mr Penguin and the Fortress of Secrets

Alex T. Smith, 2018

The Smugglers

Barbara Kimenye, 1990

The Mystery of the Singing Ghost

Gertrude Chandler Warner, Gertrude Warner, 1992