The Mark on the Door

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 Secret of the Golden Pavilion

The Mystery of the Queens Jewels

The Mystery of the Singing Serpent

Mysteries Collection 3 in 1 Vol 3 (The Mysteries Series)

The Hardy Boys

When a world-renowned scientist vanishes along with his high-tech invention, Frank and Joe Hardy are determined to track him down. Their pursuit leads to a freighter adrift in the Atlantic Ocean that carries a mysterious cargo.

Discover Your Child's Next Read

The Mark on the Door

Franklin W. Dixon, 1934

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 Secret of the Golden Pavilion

Carolyn Keene, 1959

The Mystery of the Queens Jewels

Gertrude Warner, Gertrude Chandler Warner, 1998

The Mystery of the Singing Serpent

Ed Vebell, M. V. Carey, Mary Carey, 1972

Mysteries Collection 3 in 1 Vol 3 (The Mysteries Series)

Enid Blyton, 2013