The Mystery of the Missing Mermaid | 3 | 3.0 | |
The Mystery of the Wandering Cave Man | 3 | 3.0 | |
The Mystery of the Kidnapped Whale | 3 | 3.0 | |
The Mystery of the Scar-Faced Beggar | 0 | 3.0 | |
The Mystery of the Blazing Cliffs | 3 | 3.0 | |
The Mystery of the Purple Pirate | 3 | 3.0 | |
The Mystery of the Dancing Devil | 3 | 3.0 | |
| 3 | 3.0 | |
| 0 | 3.0 | |
| 3 | 3.0 | |
| 3 | 3.0 | |
| 3 | 3.0 | |
The Mystery of the Magic Circle | 0 | 3.0 | |
The Mystery of the Sinister Scarecrow | 4 | 3.0 | |
| 3 | 3.0 | |
| 3 | 3.0 | |
The Mystery of the Headless Horse | 3.5 | 3.0 | |
The Mystery of the Deadly Double - William Arden
- Alfred Hitchcock
| 0 | 3.0 | |
The Secret of the Haunted Mirror - M.V. Carey
- Alfred Hitchcock
| 0 | 3.0 | |
The Mystery of Monster Mountain | 3.33 | 3.0 | |
| 3 | 3.0 | |
| 3.17 | 3.0 | |
The Mystery of the Dead Man's Riddle | 3 | 3.0 | |
The three investigators in The secret of Phantom Lake | 0 | 3.0 | |
The Mystery of the Shrinking House | 4 | 3.0 | |
The Mystery of the Singing Serpent | 3.5 | 3.0 | |
The Mystery of the Nervous Lion | 3 | 3.0 | |
| 3 | 3.0 | |
The Mystery of the Flaming Footprints | 3.25 | 3.0 | |
The Mystery of the Coughing Dragon | 3 | 3.0 | |
| 3 | 3.0 | |
 The Saga of Seven Suns The Saga of Seven Suns: TWO SHORT NOVELS: Includes Veiled Alliances and Whistling Past the Graveyard | 3 | 3.0 | |
The Secret of the Crooked Cat - William Arden
- Investigators Three
| 2 | 2.0 | |
The Mystery of the Laughing Shadow | 3 | 2.0 | |
| 3.31 | 3.0 | |
The Mystery of the Talking Skull | 0 | 3.0 | |
The Mystery of the Moaning Cave | 4 | 3.0 | |
The Mystery of the Screaming Clock | 3 | 3.0 | |
The Mystery of the Silver Spider | 3 | 3.0 | |
| 3 | 3.0 | |