| # | Book Title | Author | ||
|---|---|---|---|---|
| 1 | Secret of Skeleton Island, The | Campbell, Bruce | ||
| 2 | Riddle of the Stone Elephant, The | Campbell, Bruce | ||
| 3 | Black Thumb Mystery, The | Campbell, Bruce | ||
| 4 | Clue of the Marked Claw, The | Campbell, Bruce | ||
| 5 | Clue of the Coiled Cobra, The | Campbell, Bruce | ||
| 6 | Secret of Hangman's Inn, The | Campbell, Bruce | ||
| 7 | Mystery of the Iron Box, The | Campbell, Bruce | ||
| 8 | Clue of the Phantom Car, The | Campbell, Bruce | ||
| 9 | Mystery of the Galloping Horse, The | Campbell, Bruce | ||
| 10 | Mystery of the Green Flame, The | Campbell, Bruce | ||
| 11 | Mystery of the Grinning Tiger, The | Campbell, Bruce | ||
| 12 | Mystery of the Vanishing Musician, The | Campbell, Bruce | ||
| 13 | Mystery of the Shattered Glass, The | Campbell, Bruce | ||
| 14 | Mystery of the Invisible Enemy, The | Campbell, Bruce | ||
| 15 | Mystery of Gallows Cliff, The | Campbell, Bruce | ||
| 16 | Clue of the Silver Scorpion, The | Campbell, Bruce | ||
| 17 | Mystery of the Plumed Serpent, The | Campbell, Bruce | ||
| 18 | Mystery of the Sultan's Scimitar, The | Campbell, Bruce |