Novels[]
- 1994 – Of Saints and Shadows
- 1995 – Angel Souls and Devil Hearts
- 1998 – Of Masques and Martyrs
- 1999 – Strangewood
- 2001 – Straight on 'Til Morning
- 2001 – Prowlers
- 2001 – Laws of Nature
- 2001 – Predator and Prey
- 2002 – Wild Things
- 2002 – Force Majeure with Thomas E. Sniegoski
- 2002 – The Ferryman
- 2003 – The Gathering Dark
- 2004 – Astray with Amber Benson
- 2004 – The Boys Are Back in Town
- 2005 – Accursed with Amber Benson
- 2005 – King Kong
- 2005 – Windwood Road
- 2005 – Horseman with Ford Lytle Gilmore
- 2005 – Drowned with Ford Lytle Gilmore
- 2006 – The Seven Whistlers with Amber Benson
- 2006 – Mischief with Ford Lytle Gilmore
- 2006 – Enemies with Ford Lytle Gilmore
- 2006 – Bloodstained Oz with James A. Moore
- 2006 – Witchery with Amber Benson
- 2006 – The Myth Hunters
- 2007 – Baltimore, or, The Steadfast Tin Soldier and the Vampire with Mike Mignola
- 2007 – The Borderkind
- 2008 – Poison Ink
- 2008 – Soulless
- 2008 – The Lost Ones
- 2008 – Mind the Gap with Tim Lebbon
- 2009 – The Map of Moments with Tim Lebbon
- 2010 – The Chamber of Ten with Tim Lebbon
- 2010 – Dreams of the Dead as by Thomas Randall
- 2010 – When Rose Wakes
- 2011 – Spirits of Noah as by Thomas Randall
- 2011 – The Shadow Men with Tim Lebbon
- 2011 – Waking Nightmares
- 2011 – Don't Be Afraid of the Dark: Blackwood's Guide to Dangerous Fairies with Guillermo del Toro
- 2012 – Joe Golem and the Drowning City with Mike Mignola
- 2013 – The Graves of Saints
- 2013 – A Winter of Ghosts as by Thomas Randall
- 2014 – Snowblind
- 2014 – King of Hell
A Body of Evidence[]
- 1999 – Body Bags
- 1999 – Thief of Hearts
- 1999 – Soul Survivor
- 2000 – Meets the Eye
- 2000 – Head Games
- 2000 – Skin Deep
- 2001 – Burning Bones with Rick Hautala
- 2001 – Brain Trust with Rick Hautala
- 2004 – Last Breath with Rick Hautala
- 2005 – Throat Culture with Rick Hautala
Buffy the Vampire Slayer[]
- 1998 – Buffy the Vampire Slayer: Child of the Hunt with Nancy Holder
- 1999 – Buffy the Vampire Slayer: Immortal with Nancy Holder
- 1999 – Buffy the Vampire Slayer: Sins of the Father
- 2000 – Buffy the Vampire Slayer: Spike & Dru: Pretty Maids All in a Row
- 2002 – Buffy the Vampire Slayer: Oz: Into the Wild
- 2002 – Buffy the Vampire Slayer: The Wisdom of War
- 2007 – Buffy the Vampire Slayer: Dark Congress
The Gatekeeper Trilogy[]
- 1999 – Buffy the Vampire Slayer: Out of the Madhouse with Nancy Holder
- 1999 – Buffy the Vampire Slayer: Ghost Roads with Nancy Holder
- 1999 – Buffy the Vampire Slayer: Sons of Entropy with Nancy Holder
The Lost Slayer[]
- 2001 – Buffy the Vampire Slayer: Prophecies
- 2001 – Buffy the Vampire Slayer: Dark Times
- 2001 – Buffy the Vampire Slayer: King of the Dead
- 2001 – Buffy the Vampire Slayer: Original Sins
Angel[]
- 2003 – Angel: Monster Island with Thomas E. Sniegoski
Novellas[]
- 2002 – Pyre
- 2003 – Voodoo Lounge
- 2006 – The Shell Collector
- 2006 – Legacy with Amber Benson
- 2006 – Embers with Amber Benson
- 2006 – Illusions with Amber Benson
- 2012 – Father Gaetano's Puppet Catechism: A Novella with Mike Mignola
Buffy the Vampire Slayer (YA)[]
- 1997 – Buffy the Vampire Slayer: Halloween Rain with Nancy Holder
- 1998 – Buffy the Vampire Slayer: Blooded with Nancy Holder
Anthologies[]
- 2003 – Four Dark Nights with Douglas Clegg, Bentley Little and Tom Piccirilli
- 2009 – British Invasion with James A. Moore and Tim Lebbon
- 2010 – The New Dead: A Zombie Anthology
- 2011 – The Monster's Corner
- 2012 – 21st Century Dead: A Zombie Anthology
- 2013 – Four Summoner's Tales with Kelley Armstrong, David Liss and Jonathan Maberry
- 2013 – Mister October, Volume I: An Anthology in Memory of Rick Hautala
- 2013 – Mister October, Volume II: An Anthology in Memory of Rick Hautala
- 2014 – Dark Duets: All-New Tales of Horror and Dark Fantasy
Collections[]
- 2005 – Initiation with Amber Benson
- 2010 – The Secret Back of Things
- 2013 – Tell My Sorrows to the Stones
Novelettes[]
- 1995 – Facets of Solitaire
- 2002 – 8 P.M.: I Still Believe
- 2007 – The Mournful Cry of Owls
- 2007 &ndahs; All Aboard
- 2008 – The Hiss of Escaping Air
- 2013 – Pipers
Short Stories[]
- 1994 – One
- 1995 – What's Yer Poison? with José R. Nieto
- 1996 – The Last Straw
- 1997 – Dead Flies on My Shoulder
- 1998 – Lament for the Gunwitch
- 1998 – Hiding with Nancy Holder
- 2000 – Runaway
- 2000 – The Nuckelavee with Mike Mignola
- 2002 – Dakini
- 2004 – Venus and Mars
- 2004 – Wall to Wall
- 2005 – The Secret Backs of Things
- 2006 – The Art of the Deal
- 2006 – Digger with Rick Hautala
- 2007 – Shaft 39
- 2007 – Under Cover of Night
- 2007 – Breathe My Name
- 2008 – Room Service
- 2009 – Quiet Bullets
- 2009 – Mechanisms with Mike Mignola
- 2010 – Thin Walls
- 2010 – Pa-Kow
- 2010 – The Urge
- 2010 – Burning Questions
- 2012 – Put On a Happy Face
- 2013 – Nesting
- 2017 – Blowback
Non-Fiction[]
- 1991 – Cut! Horror Writers on Horror Film
- 1998 – The Watcher's Guide: Volume 1 with Nancy Holder
- 1999 – Sunnydale High Yearbook with Nancy Holder
- 1999 – Buffy the Vampire Slayer: The Monster Book with Stephen R. Bissette and Thomas E. Sniegoski
- 2001 – The Stephen King Universe with Stanley Wiater and Hank Wagner
- 2008 – Prince of Stories: The Many Worlds of Neil Gaiman with Hank Wagner and Stephen R. Bissette