The Secret Panel
Franklin W. Dixon
The Hardy Boys (25)
The Message
K. A. Applegate
Animorphs (4)
The Clue in the Old Stagecoach
Carolyn Keene
Secret Seven Adventure
Enid Blyton
Secret Seven (2)
Alistair MacLean's Time of the Assassins
Alastair Macneill & Alistair MacLean