Inconstant Moon
1. Human Resource (2005)
2. Fall Girl (2005)
3. Exit Strategy (2006)

Spiderman and Iron Man (1997) (with Danny Fingeroth)
Spider-Man and Iron Man: Sabotage (1997)
The Avengers and the Thunderbolts (1998)
Gateway to the Stars: Marc Miller's Traveller (1998)

Alias (with J J Abrams)
15. Collateral Damage (2005)

Kolchak: The Night Stalker (with Mike Baron, Rachel Caine, Mark Dawidziak, Tom DeFalco, P N Elrod, John Everson, Joe Gentile, Christopher Golden, Elizabeth Massie, John Ostrander, Gary Phillips, Robert J Randisi, James Reasoner and Richard Dean Starr)
The Night Stalker Casebook (2006)

Buffy the Vampire Slayer (Young Adult) (with Diana G Gallagher, Christopher Golden and Nancy Holder)
Halloween Rain / Bad Bargain / Afterimage: Buffy the Vampire Slayer 2 (omnibus) (2010)