| # | Book Title | Author | |
|---|---|---|---|
| 1 | Mystery of the Carousel Horse, The | Murphy, Elspeth Campbell | |
| 2 | Mystery of the Double Trouble, The | Murphy, Elspeth Campbell | |
| 3 | Mystery of the Gravestone Riddle, The | Murphy, Elspeth Campbell | |
| 4 | Mystery of the Laughing Cat, The | Murphy, Elspeth Campbell | |
| 5 | Mystery of the Messed-Up Wedding, The | Murphy, Elspeth Campbell | |
| 6 | Mystery of the Second Map, The | Murphy, Elspeth Campbell | |
| 7 | Mystery of the Silent Idol, The | Murphy, Elspeth Campbell | |
| 8 | Mystery of the Silver Dolphin, The | Murphy, Elspeth Campbell | |
| 9 | Mystery of the Tattletale Parrot, The | Murphy, Elspeth Campbell | |
| 10 | Mystery of the Vanishing Present, The | Murphy, Elspeth Campbell |