- Maniac
- Poison
- Shattered
- Talons
- The Mystery Files of Shelby Woo: Hot Rock
- The Secret of Dragonhome
- The Secret World of Alex Mack: I Spy, Lost in Vegas
- The Young Astronauts: Ready For Blastoff! (written as "Rick North")
- Freedom's Fire (written as "J.P.Trent")
Are You Afraid of the Dark? series
- The Tale Of The Sinister Statues
- The Tale Of The Restless House
- The Tale Of The Zero Hero
- The Tale Of The Three Wishes
Carmen Sandiego series
All published by Western Publishing
- Where In America Is Carmen Sandiego?
- Where In America's Past Is Carmen Sandiego?
- Where In Europe Is Carmen Sandiego?
- Where In Space Is Carmen Sandiego?
- Where In The World Is Carmen Sandiego?
- Where In The USA Is Carmen Sandiego?
- Where In The USA Is Carmen Sandiego Part II?
- Where In Time Is Carmen Sandiego?
- Where In Time Is Carmen Sandiego Part II?
Diadem series
The first six books in this series were originally published by Apple . After the cancellation of the series by Apple (Scholastic), books 1-6 were reprinted by Llewellyn Publications in 2004—2005 and books 7 onwards were published directly by Llewllyn. Also published in French by AdA editions. Called "Les mondes de la magie du Diadème"
- Book of Names (August 1997. Paperback ISBN 0-590-05947-5, Reprint ISBN 0-7387-0617-5)
- Book of Signs (August 1997. Paperback ISBN 0-590-05948-3, Reprint ISBN 0-7387-0616-7)
- Book of Magic (August 1997. Paperback ISBN 0-590-05949-1, Reprint ISBN 0-7387-0615-9)
- Book of Thunder (Hardback ISBN 0-590-05950-5, Reprint ISBN 0-7387-0614-0)
- Book of Earth (February 1998. Paperback ISBN 0-590-14965-2, Reprint ISBN 0-7387-0613-2)
- Book of Nightmares (April 1998. Paperback ISBN 0-590-14966-0, Reprint ISBN 0-7387-0612-4)
- Book of War (May 2005. ISBN 0-7387-0611-6)
- Book of Oceans (September 2005, ISBN 0-7387-0748-1)
- Book of Reality (February 2006. ISBN 0-7387-0843-7)
- Book of Doom (June 2006, ISBN 0-7387-0842-9)
Doctor Who series
- The Chase
- Mission to the Unknown
- The Mutation of Time
- The Power of the Daleks
- The Evil of the Daleks
- War of the Daleks
- Legacy of the Daleks
- The Gallifrey Chronicles
- Evolution
- Genesys
Eerie, Indiana series
- Eerie, Indiana: Bureau of Lost ISBN 0-380-79775-5
- Eerie, Indiana: Simon and Marshall's Excellent Adventure ISBN 0-380-79777-1
James Bond, Jr. series
All published by Puffin in 1992 and written under the pen name "John Vincent."
- A View To A Thrill
- The Eiffel Target
- Sandblast
- Live And Let's Dance
- Sword Of Death
- High Stakes
Shockers series
Published by Grosset & Dunlap.
- Shockers: Alien Prey
- Shockers: Blood Wolf
- Shockers: Dead End
- Shockers: Ghost Lake
- Shockers: Grave Doubts
- Shockers: Night Wings
Deep Space Nine series
- Objective: Bajor (May 1996, ISBN 0-671-56811-6)
2099 series
- Doomsday (September 1999, ISBN 0-439-06030-3)
- Betrayal (November 1999, ISBN 0-439-06031-1)
- Traitor (January 2000, ISBN 0-439-06032-X)
- Revolution (March 2000, ISBN 0-439-06033-8)
- Meltdown (May 2000, ISBN 0-439-06034-6)
- Firestorm (July 2000, ISBN 0-439-06035-4)
Tombstones series
Published by Pocket Books in 1995.
- Dances With Werewolves
- The Last Drop
Written as "Nicholas Adams"
All published by HarperCollins. "Nicholas Adams" is also the pen name for Debra Doyle and James D. Macdonald. See their pages for more information on them.
- I.O.U. (1991)
- Santa Claws (1991)
- Horrorscope (1992) ISBN 0-061-06109-3