The Shattered Helmet

Running on Empty (Hardy Boys Casefiles #36)

The Twin Dilemma

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 Singing Ghost

The Mystery of the Shrinking House

Nancy Drew and the Clue Crew Series

The Hardy Boys

The Hardy Boys, Frank and Joe, are on another adventure. This time they're investigating the disappearance of a collection of rare coins, which leads them to a dangerous gang of criminals.

Discover Your Child's Next Read

The Shattered Helmet

Franklin W. Dixon, 1973

Running on Empty (Hardy Boys Casefiles #36)

Franklin W. Dixon, 1993

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

Franklin W. Dixon, 1997

The Mystery of the Singing Ghost

Gertrude Chandler Warner, Gertrude Warner, 1992

The Mystery of the Shrinking House

Jack Hearne, Alfred Hitchcock, William Arden, 1972

Nancy Drew and the Clue Crew Series

Carolyn Keene, 2015