Holder has written over 50 romances and horror novels and hundreds of
short stories, essays, and articles. Alone and in collaboration with
other authors, she has written dozens of tie-in novels related to
_Buffy the Vampire Slayer (1997) (TV)_, _Angel (1999/I) (TV)_, _Highlander (1992) (TV)_, _Sabrina, the Teenage Witch (1996) (TV)_ and _Smallville (2001) (TV)_.