Book 1
The Secret of the Skeleton Key
Penny Warner
Book 2
The Haunted Lighthouse
Penny Warner
Book 3
The Mystery of the Pirate's Treasure
Penny Warner
Book 4
The Mummy's Curse
Penny Warner
Book 5
The Hunt for the Missing Spy
Penny Warner
Book 6
The Secret of the Puzzle Box
Penny Warner
Book 7
A Disappearance in Magicland
Penny Warner
Book 8
The Science Fair Scheme
Penny Warner
Book 9
The Haunting of Mystery Mansion
Penny Warner
Book 10
Clash of the Secret Code Clubs
Penny Warner