- Zack Files
Zack Files 04: Zap! I'm a Mind Reader (Zack Files), Zack Files 25: Trapped in the Museum of Unnatural History (Zack Files), Zack Files 26: Me and My Mummy (Zack Files), Zack Files 06: I'm out of My Body...Please Leave a Message (Zack Files), Zack Files 19: The Boy Who Cried Bigfoot (Zack Files), Zack Files 28: Tell a Lie and Your Butt Will Grow (Zack Files), Zack Files 01: My Great-grandpa's in the Litter Box (Zack Files), Zack Files 29: Just Add Water and....Scream! (Zack Files), Zack Files 11: How to Speak to Dolphins in Three Easy Lessons (Zack Files), Zack Files 09: The Volcano Goddess Will See You Now (Zack Files)
- Zaddack Tales
Mentor's Lair : Book 2 of the Zaddack Tales
- Zanthar
Zanthar at Trip's End, Zanthar At The Edge Of Never, Zanthar Of The Many Worlds, Zanthar at Moon's Madness, ZANTHAR OF THE MANY WORLDS, Zanthar of the Many Worlds, Zanthar At Moons Madness, Zanthar Of The Many Worlds, ZANTHAR AT MOON'S MADNESS - Zanthar Sequence Book (3) Three, Zanthar at Trip's End
- Zanthodon
The Adventures of Eric Carstairs in Zanthodon Series: Journey to the Underground World, Zanthodon, Eric of Zanthodon (Set of 5), Eric of Zanthodon, Zanthodon, Eric of Zanthodon, Zanthodon, Darya of the Bronze Age: The Adventures of Eric Carstairs in Zanthodon
- Zarkon
Zarkon, Lord of the Unknown in The nemesis of evil: A case from the files of Omega, The Volcano Ogre (Zarkon, Lord of the Unknown), Zarkon, Lord of the Unknown, in the Earth-Shaker: A Case from the Files of Omega, Volcano Ogre (Zarkon, Lord of the Unknown Ser.), Zarkon Principle, The Nemesis of Evil (Zarkon, Lord of the Unknown), The Zarkon Principle, Invisible Death Zarkon Lord of the Unknown, Volcano Ogre, Zarkon Lord of the Unknown, Zarkon, Lord of the Unknown in invisible death: A case from the files of Omega
- Zodiac Chillers
Twisted Taurus (Zodiac Chillers , No 4), In Leo's Lair (Zodiac Chillers , No 3), Never Love a Libra (Zodiac Chillers , No 5), The Scorpio Society (Zodiac Chiller, No 2), Rage of Aquarius (Zodiac Chillers, No 1), Pisces Drowning (Zodiac Chillers, No 6), Zodiacs: Capricorn: Don't Look Back (Zodiac), Zodiacs: Virgo: Desperately Yours (Zodiac), Zodiacs: Cancer: Dark Shadows (Zodiac), Zodiacs: Pisces: Sixth Sense (Zodiac)
- Zorachus
Zorachus