Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | The Secret of the Skeleton Key | 2011 | Penny Warner | Buy |
| 2 | The Haunted Lighthouse | 2012 | Penny Warner | Buy |
| 3 | The Mystery of the Pirate’s Treasure | 2013 | Penny Warner | N/A |
| 4 | The Mystery of the Pirate’s Treasure / Secret Treasure of Pirate Cove | 2013 | Penny Warner | Buy |
| 5 | The Mummy’s Curse | 2014 | Penny Warner | Buy |
| 6 | The Hunt for the Missing Spy | 2015 | Penny Warner | Buy |
| 7 | The Secret of the Puzzle Box | 2016 | Penny Warner | Buy |
| 8 | A Disappearance in Magicland | 2024 | Penny Warner | Buy |
| 9 | The Science Fair Scheme | 2024 | Penny Warner | Buy |
| 10 | The Haunting of Mystery Mansion | 2024 | Penny Warner | Buy |
| 11 | Clash of the Secret Code Clubs | 2024 | Penny Warner | Buy |
| 12 | Escape from Bigfoot | 2025 | Penny Warner | Buy |
| 13 | The Search for the Missing Mascot | 2025 | Penny Warner | Buy |
The Code Busters Club combines mystery storytelling with interactive puzzle-solving for middle-grade readers. Starting with The Secret of the Skeleton Key (2011), the series follows a group of friends who use codes, ciphers, and cryptography to crack cases. Each book includes real codes that readers can decipher alongside the characters, adding an educational, hands-on element to the mysteries.
The series ran from 2011 to 2016 before returning in 2024 with several new installments, including A Disappearance in Magicland and Escape from Bigfoot. The Code Busters Club continues to appeal to young readers who enjoy both the thrill of mystery and the satisfaction of cracking codes.