| # | Book Title | Author | |
|---|---|---|---|
| 1 | Mystery of the Burnt Cottage, The | Blyton, Enid | |
| 2 | Mystery of the Disappearing Cat, The | Blyton, Enid | |
| 3 | Mystery of the Secret Cat, The | Blyton, Enid | |
| 4 | Mystery of the Spiteful Letters, The | Blyton, Enid | |
| 5 | Mystery of the Missing Necklace, The | Blyton, Enid | |
| 6 | Mystery of the Hidden House, The | Blyton, Enid | |
| 7 | Mystery of the Pantomime Cat, The | Blyton, Enid | |
| 8 | Mystery of the Invisible Thief, The | Blyton, Enid | |
| 9 | Mystery of Holly Lane, The | Blyton, Enid | |
| 10 | Mystery of the Strange Bundle, The | Blyton, Enid | |
| 11 | Mystery of Holly Lane, The | Blyton, Enid | |
| 12 | Mystery of Tally-Ho Cottage, The | Blyton, Enid | |
| 13 | Mystery of the Missing Man, The | Blyton, Enid | |
| 14 | Mystery of the Strange Messages, The | Blyton, Enid | |
| 15 | Mystery of Banshee Towers, The | Blyton, Enid |