 Morris has contributed short fiction to the shared universe fantasy series "Thieves' World", in which she created the Sacred Band of Stepsons, a mythical unit of ancient fighters modeled on the Sacred Band of Thebes.She created, orchestrated, and edited the Bangsian fantasy series "Heroes in Hell", writing stories for the series as well as co-writing the related novel, "The Little Helliad", with Chris Morris.Most of her fiction work has been in the fantasy and science fiction genres, although she has also written historical and other novels.