- E-bookLadies NightPenny Warner
- E-bookRock-a-Bye BabyPenny Warner
- E-bookThe Hunt for the Missing SpyPenny Warner
- E-bookThe Secret of the Puzzle BoxPenny Warner
- E-bookThe Haunted LighthousePenny Warner
- E-bookThe Secret of the Skeleton KeyPenny Warner
- E-bookThe Science Fair SchemePenny Warner
- E-bookThe Haunting of Mystery MansionPenny Warner
- E-bookThe Mummy's CursePenny Warner
- E-bookThe Mystery of the Haunted CavesPenny Warner
- E-bookThe Hunt for the Missing SpyPenny Warner
- E-bookSerie: The Code Busters ClubPenny Warner
- E-bookThe Haunted LighthousePenny Warner
- E-bookClash of the Secret Code ClubsPenny Warner
- E-bookThe Mystery of the Pirate's TreasurePenny Warner