In the fantasy The Door Between, Melissa is caught between Celtic superstition and the modern world. She must visit the "Otherworld" in order to save her present-day town of Four Corners.

Award-winning Annie on My Mind is a sensitive, believable story of a college freshman who reflects on the previous year when she met and fell in love with Annie. This romance deals with another controversial subject, the feelings of homosexuality.

Garden became interested in vampires while doing summer theater, and wrote a series of four books on the occult for Lippencott's "Weird and Horrible Library": Devils and Demons, Vampires, Werewolves, and Witches. She also wrote Prisoner of Vampires (1986) and My Sister the Vampire (1992). A series of monster hunter mysteries for audiences in grades four to six includes Mystery of the Night Raiders (1987), Mystery of the Midnight Menace (1988), and Mystery of the Secret Marks (1989).