- "Subtle Blood" (1994)
- "The Last Banquet" (1996)
- "A Man of Parts" (1998)
- "The Blind Banker" (2000)
- "Empire of Death" (2002)
- "The Devil's Backbone" (2004)
- "The God Makers" (2006)
- "The Heretic's Betrayal" (2008)
- "The Shadow War" (2010)
- "The Doomsday Conspiracy" (2012)
- "The Judas Strain" (2014)
- "The 39 Steps" (2016)
- "The Blue Horizon" (2020)
Non-fiction:
- "Watchmen: The Complete Companion" (2005)
- "The World of Watchmen" (2006)
- "The DC Comics Encyclopedia" (2008)
- "The Marvel Comics Encyclopedia" (2009)
- "The Illustrated Encyclopedia of Science Fiction" (2011)
- "The Illustrated Encyclopedia of Fantasy" (2013)
- "The Illustrated Encyclopedia of Horror" (2015)
- "The Illustrated Encyclopedia of Superheroes" (2017)
- "The Illustrated Encyclopedia of Villains" (2019)
- "The Illustrated Encyclopedia of Science" (2021)