| # | Book Title | Author | |
|---|---|---|---|
| 1 | House with a Clock in Its Walls, The | Bellairs, John | |
| 2 | Figure in the Shadows, The | Bellairs, John | |
| 3 | Letter, the Witch, and the Ring, The | Bellairs, John | |
| 4 | Ghost in the Mirror, The | Bellairs, John | |
| 5 | Vengeance of the Witch-Finder, The | Bellairs, John | |
| 6 | Doom of the Haunted Opera, The | Bellairs, John | |
| 7 | Specter from the Magician's Museum, The | Strickland, Brad | |
| 8 | Beast Under the Wizard's Bridge, The | Strickland, Brad | |
| 9 | Tower at the End of the World, The | Strickland, Brad | |
| 10 | Whistle, the Grave, and the Ghost, The | Strickland, Brad | |
| 11 | House Where Nobody Lived, The | Strickland, Brad | |
| 12 | Sign of the Sinister Sorcerer, The | Strickland, Brad |