The Sinister Signpost

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 Clue of the Tapping Heels

The Black Island - Classic Colour Edition

Go Ahead Secret Seven

Encyclopedia Brown Box Set

The Hardy Boys

In the thirty-sixth book of the Hardy Boys series, the Hardy boys face a difficult challenge when a new invention, a machine that can make a man invisible, is stolen from their father's client. The brothers travel to Kentucky to investigate a series of strange occurrences at a recently constructed bridge, finding themselves drawn into a web of danger and intrigue that requires all their detective skills to solve.

Discover Your Child's Next Read

The Sinister Signpost

Franklin W. Dixon, 1936

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 Clue of the Tapping Heels

Carolyn Keene, Russell H. Tandy, 1939

The Black Island - Classic Colour Edition

Hergé, 1943

Go Ahead Secret Seven

Enid Blyton, 1953

Encyclopedia Brown Box Set

Donald Sobol, 1963