Spellkey series
- The Spellkey (1987), jacket by Caldecott-medal winner David Wiesner, also a UK paperback edition from Futura/Macmillan.
- The Glass Salamander (1989), jacket by Caldecott-medal winner David Wiesner
- The Books of the Keepers (1993)
All three books were collected into a paperback omnibus edition,
The Spellkey Trilogy, published by Baen Books in 1995.
Hatching Magic series U.S. edition jackets by Omar Rayyan
- Hatching Magic (2003; Scholastic Book Club selection; translated into German, Dutch, Italian, Portuguese, Polish, Thai, and Spanish; additional languages pending)
- The Dragon of Never-Was (2006)
Other Fiction
- “Somnus’s Fair Maid” (short-listed for the James Tiptree Jr. prize), a Regency retelling of the Sleeping Beauty fairy tale, in Black Thorn, White Rose, edited by Terri Windling and Ellen Datlow
- Short stories and poetry in Gargoyle Magazine in the late 1980s, including excerpts from an unpublished novel.
- “Bread-and-Butterflies” in Alice Redux (2006), a collection of short fiction inspired by Lewis Carroll and edited by Richard Peabody.