| # | Book Title | Author | |
|---|---|---|---|
| 1 | Clue in Blue, The | Allen, Betsy | |
| 2 | Riddle in Red, The | Allen, Betsy | |
| 3 | Puzzle in Purple, The | Allen, Betsy | |
| 4 | Secret of Black Cat Gulch, The | Allen, Betsy | |
| 5 | Green Island Mystery, The | Allen, Betsy | |
| 6 | Ghost Wore White, The | Allen, Betsy | |
| 7 | Yellow Warning, The | Allen, Betsy | |
| 8 | Gray Menace, The | Allen, Betsy | |
| 9 | Brown Satchel Mystery, The | Allen, Betsy | |
| 10 | Peril in Pink | Allen, Betsy | |
| 11 | Silver Secret, The | Allen, Betsy | |
| 12 | Mystery of the Ruby Queens, The | Allen, Betsy |