- The Secret of Terror CastleRobert Arthur
- The Mystery of the Green GhostRobert Arthur
- The Mystery of the Stuttering ParrotRobert Arthur
- The Mystery of the Whispering MummyRobert Arthur
- The Mystery of the Flaming FootprintsRobert Arthur, M. V. Carey
- The Mystery of the Talking SkullRobert Arthur
- The Mystery of the Fiery EyeRobert Arthur
- The Mystery of the Vanishing TreasureRobert Arthur
- The Mystery of the Silver SpiderRobert Arthur
- The Secret of Skeleton IslandRobert Arthur
- The Mystery of the Moaning CaveDennis Lynds, Roger Hall et al.
- The Secret of the Crooked CatRobert Arthur, Dennis Lynds
- Ghosts And More GhostsRobert Arthur
- The Mystery of the Screaming ClockRobert Arthur
- Thrillers and More ThrillersRobert Arthur, August Derleth et al.
- The three investigatorsRobert Arthur
- Mystery and more mysteryRobert Arthur
- MYSTERY OF THE TRAIL OF TERROR (Three Investigators, No 39)Robert Arthur
- MYSTERY OF THE BLAZING CLIFFS (Three Investigators, No 32)Robert Arthur
- THRILLER DILLER #6 (The 3 investigators)Robert Arthur
- MYSTERY OF THE DEADLY DOUBLERobert Arthur
- Secret of skeleton islandRobert Arthur
- Ghosts & More Ghosts (Windward Book)Robert Arthur
