By John Bellairs
- #1: The Curse of the Blue Figurine (May 1983)
- #2: The Mummy, the Will, and the Crypt (Nov. 1983)
- #3: The Spell of the Sorcerer's Skull (Nov. 1984)
- #4: The Revenge of the Wizard's Ghost (Nov. 1985)
- #5: The Eyes of the Killer Robot (Oct. 1986)
- #6: The Trolley to Yesterday (May 1989)
- #7: The Chessmen of Doom (Nov. 1989)
- #8: The Secret of the Underground Room (Dec. 1990)
by John Bellairs, completed by Brad Strickland
- #9: The Drum, the Doll, and the Zombie (Sept. 1994)
By Brad Strickland
- #10: The Hand of the Necromancer (1996)
- #11: The Bell, the Book, and the Spellbinder (1997)
- #12: The Wrath of the Grinning Ghost (1999)
- #13: The Stone, the Cipher, and the Shadows (2022)
