- The Twyford code, Janice Hallett
- Into the gauntlet, Margaret Peterson Haddix
- The bridge to Never Land, by Dave Barry and Ridley Pearson
- The 6th Extinction, James Rollins
- York :, the shadow cipher, Laura Ruby
- Trust no one, Linda Sue Park
- Beyond the grave, Jude Watson
- Mission atomic, Sarwat Chadda
- The Ruby Redfort collection, Lauren Child
- Mission atomic, Sarwat Chadda
- The final gambit, Jennifer Lynn Barnes
- King & Kayla and the case of the secret code, written by Dori Hillestad Butler ; illustrated by Nancy Meyers
- Mission Titanic, Jude Watson
- The haunted lighthouse, Penny Warner
- The Black Circle, Patrick Carman
- Day of doom, David Baldacci
- The unbreakable code, Jennifer Chambliss Bertman ; with illustrations by Sarah Watts
- Charlie Thorne and the lost city, Stuart Gibbs
- In too deep, Jude Watson
- The star dunes, Trudi Trueit
- The eye of God, James Rollins
- The black circle, Patrick Carman
- Nowhere to run, Jude Watson
- Charlie Thorne and the Royal Society, Stuart Gibbs
- The dead of night, Peter Lerangis
- Ruby Redfort take your last breath, Lauren Child
- Pirate, Clive Cussler and Robin Burcell
- The hunt for the missing spy, Penny Warner
- Flashpoint, Gordon Korman
- Ruby Redfort pick your poison, Lauren Child
- The mummy's curse, Penny Warner
- The Hawthorne legacy, Jennifer Lynn Barnes
- The maze of bones, Rick Riordan
- A king's ransom, Jude Watson
- The Metropolitans, Carol Goodman
- The killing code, Ellie Marney
- Mission hurricane, Jenny Goebel
- The tiger's nest, Trudi Trueit
- The emperor's code, Gordon Korman
- The Alcatraz escape, Jennifer Chambliss Bertman ; with illustrations by Sarah Watts
- The Hawthorne legacy, Jennifer Lynn Barnes
- The maze of bones, Rick Riordan
- Charlie Thorne and the last equation, Stuart Gibbs
- Ruby Redfort feel the fear, Lauren Child
- The sword thief, Peter Lerangis
- The doomsday key, James Rollins
- Simple genius, David Baldacci
- Charlie Thorne and the curse of Cleopatra, Stuart Gibbs
- Rescue, Jennifer A. Nielsen
- The secret cipher, Whitaker Ringwald