| # | Book Title | Author | |
|---|---|---|---|
| 1 | Secret of the Skeleton Key, The | Warner, Penny | |
| 2 | Haunted Lighthouse, The | Warner, Penny | |
| 3 | Mystery of the Pirate's Treasure, The | Warner, Penny | |
| 4 | Mummy's Curse, The | Warner, Penny | |
| 5 | Hunt for the Missing Spy, The | Warner, Penny | |
| 6 | Secret of the Puzzle Box, The | Warner, Penny |