By John Bellairs
- #1: The House with a Clock in its Walls (June 1973)
- #2: The Figure in the Shadows (1975)
- #3: The Letter, the Witch, and the Ring (Jan. 1976)
by John Bellairs, completed by Brad Strickland
- #4: The Ghost in the Mirror (April 1993)
- #5: The Vengeance of the Witch-Finder (Sept. 1993)
- #6: The Doom of the Haunted Opera (Sept. 1995)
By Brad Strickland
- #7: The Specter from the Magician's Museum (1998)
- #8: The Beast under the Wizard's Bridge (2000)
- #9: The Tower at the End of the World (2001)
- #10: The Whistle, the Grave, and the Ghost (2003)
- #11: The House where Nobody Lived (2006)
- #12: The Sign of the Sinister Sorcerer (2008)
