| Series | | Books |
| |
| Secret Agent Dingledorf | | (2002) |
| | | (2002) |
| | | (2002) |
| | | (2003) |
| | | (2003) |
| | | (2005) |
| |
| Other | | AAAARGH!!! [TJ and the Time Stumblers] (2011) |
| | | The Ancients [Forbidden Doors] (1998) |
| | | Angel of Wrath [Voice of God] (2009) |
| | | Back to the Drawing Board [McGee and Me] (1990) |
| | | Baseball for Breakfast [Bug Parables] (1999) |
| | | Beauty in the Least [McGee and Me] (1993) |
| | | The Big Lie [McGee and Me] (1990) |
| | | Blood of Heaven [Fire of Heaven] (1996) |
| | | The Blunder Years [McGee and Me] (1993) |
| | | The Cards [Forbidden Doors] (2003) |
| | | Case of the Missing Minds [Bloodhounds, Inc.] (1999) |
| | | The Chamber of Lies [Elijah Project] (2009) |
| | | Child's Play [Last Fool] (2014) |
| | | Choices [Truth Seekers] (2014) |
| | | The Curse [Forbidden Doors] (1997) |
| | | The Curse of the Horrible Hair Day [Bloodhounds, Inc.] (2001) |
| | | The Deceived [Forbidden Doors] (1994) |
| | | Devoted Heart (2017) |
| | | Do the Bright Thing [McGee and Me] (1990) |
| | | Eli (2000) |
| | | The Encounter [Forbidden Doors] (1995) |
| | | The Enemy Closes in (2009) (with James Ri[Elijah Project] (rdan) |
| | | The Experiment [Imager Chronicles] (1991) |
| | | The Face of God (2002) |
| | | Fangs for the Memories [Bloodhounds, Inc.] (1999) |
| | | Fire of Heaven [Fire of Heaven] (1999) |
| | | Freddie's Fast-Cash Getaway [Bug Parables] (2009) |
| | | Ghost of Krzy [Bloodhounds, Inc.] (1997) |
| | | The God Hater aka Saving Alpha (2010) |
| | | The Guardian [Forbidden Doors] (1995) |
| | | The Haunting [Forbidden Doors] (1995) |
| | | Ho-Ho-NOOO! [TJ and the Time Stumblers] (2011) |
| | | The House That Went Ker-Splat! [Bug Parables] (2008) |
| | | I Want My Mummy [Bloodhounds, Inc.] (2000) |
| | | In the Nick of Time [McGee and Me] (1993) |
| | | Invasion of the UFO's [Bloodhounds, Inc.] (1998) |
| | | A Journey of Faith (2003) |
| | | The Judas Gospel (2011) |
| | | The Machine [Truth Seekers] (2013) |
| | | My Life As a Beat-Up Basketball Backboard [Incredible Worlds of Wally McDoogle] (2000) |
| | | My Life As a Belching Baboon with Bad Breath [Incredible Worlds of Wally McDoogle] (2005) |
| | | My Life As a Bigfoot Breath Mint [Incredible Worlds of Wally McDoogle] (1997) |
| | | My Life As a Blundering Ballerina [Incredible Worlds of Wally McDoogle] (1997) |
| | | My Life As a Broken Bungee Cord [Incredible Worlds of Wally McDoogle] (1993) |
| | | My Life As a Computer Cockroach [Incredible Worlds of Wally McDoogle] (1999) |
| | | My Life As a Cowboy Cowpie [Incredible Worlds of Wally McDoogle] (2001) |
| | | My Life as a Haunted Hamburger, Hold the Pickles [Incredible Worlds of Wally McDoogle] (2006) |
| | | My Life As a Human Hairball [Incredible Worlds of Wally McDoogle] (1998) |
| | | My Life As a Human Hockey Puck [Incredible Worlds of Wally McDoogle] (1994) |
| | | My Life As a Prickly Porcupine from the Planet Pluto [Incredible Worlds of Wally McDoogle] (2004) |
| | | My Life as a Screaming Skydiver [Incredible Worlds of Wally McDoogle] (1998) |
| | | My Life as a Sky Surfing Skateboarder [Incredible Worlds of Wally McDoogle] (2002) |
| | | My Life As a Smashed Burrito [Incredible Worlds of Wally McDoogle] (1993) |
| | | My Life As a Splatted Flat Quarterback [Incredible Worlds of Wally McDoogle] (2005) |
| | | My Life as a Stupendously Stomped Soccer Star [Incredible Worlds of Wally McDoogle] (2006) |
| | | My Life As a Supersized Superhero with Slobber [Incredible Worlds of Wally McDoogle] (2007) |
| | | My Life As a Tarantula Toe Tickler [Incredible Worlds of Wally McDoogle] (2003) |
| | | My Life As a Toasted Time Traveler [Incredible Worlds of Wally McDoogle] (1996) |
| | | My Life As a Torpedo Test Target [Incredible Worlds of Wally McDoogle] (1994) |
| | | My Life As a Walrus Whoopee Cushion [Incredible Worlds of Wally McDoogle] (1999) |
| | | My Life As Alien Monster Bait [Incredible Worlds of Wally McDoogle] (1993) |
| | | My Life As an Afterthought Astronaut [Incredible Worlds of Wally McDoogle] (1995) |
| | | My Life As Crocodile Junk Food [Incredible Worlds of Wally McDoogle] (1993) |
| | | My Life as Dinosaur Dental Floss [Incredible Worlds of Wally McDoogle] (1994) |
| | | My Life As Invisible Intestines [Incredible Worlds of Wally McDoogle] (2001) |
| | | My Life As Polluted Pond Scum [Incredible Worlds of Wally McDoogle] (1996) |
| | | My Life As Reindeer Road Kill [Incredible Worlds of Wally McDoogle] (1995) |
| | | Mystery of the Invisible Knight [Bloodhounds, Inc.] (1997) |
| | | Mystery of the Melodies from Mars [Bloodhounds, Inc.] (2002) |
| | | Nervous Norman Hot on the Trail [Bug Parables] (2009) |
| | | New Kid Catastrophes [TJ and the Time Stumblers] (2011) |
| | | The Not-So-Great Escape [McGee and Me] (1989) |
| | | On the Run (2009) (with James Ri[Elijah Project] (rdan) |
| | | Oops [TJ and the Time Stumblers] (2011) |
| | | Phantom of the Haunted Church [Bloodhounds, Inc.] (1998) |
| | | The Portal [Imager Chronicles] (1991) |
| | | The Presence [Soul Tracker] (2005) |
| | | Room with a Boo [Bloodhounds, Inc.] (2002) |
| | | The Scam of the Screwball Wizards [Bloodhounds, Inc.] (2001) |
| | | The Scream [Forbidden Doors] (1998) |
| | | Secret of the Ghostly Hot Rod [Bloodhounds, Inc.] (2000) |
| | | Seeing [Soul Tracker] (2007) |
| | | Skate Expectations! [McGee and Me] (1989) |
| | | The Society [Forbidden Doors] (1994) |
| | | Soul Tracker [Soul Tracker] (2004) |
| | | The Spell [Forbidden Doors] (1995) |
| | | A Star in the Breaking [McGee and Me] (1990) |
| | | Stink Bug Saves the Day! [Bug Parables] (2011) |
| | | Switched! [TJ and the Time Stumblers] (2012) |
| | | The Tablet [Imager Chronicles] (1992) |
| | | Take Me Out of the Ball Game [McGee and Me] (1993) |
| | | That Awkward Age [Last Fool] (2015) |
| | | Threshold [Fire of Heaven] (1997) |
| | | Trapped By Shadows [Elijah Project] (2009) |
| | | Twas the Fight Before Christmas [McGee and Me] (1990) |
| | | Twister and Shout [McGee and Me] (1989) |
| | | The Undead [Forbidden Doors] (1997) |
| | | The Voice [Voice of God] (2008) |
| | | The Wager (2003) |
| | | When the Last Leaf Falls (2001) |
| | | The Whirlwind [Imager Chronicles] (1992) |
| | | The Wiccan [Forbidden Doors] (2003) |
| | | Yikes!!! [TJ and the Time Stumblers] (2012) |
| |