Geary Gravel

Geary Gravel is an American science fiction author and professional sign language interpreter. He lives in western Massachusetts and has written thirteen books.

Autumnworld Mosaic

 * The Alchemists (1984; nominated for Philip K. Dick Award for best novel)
 * The Pathfinders (1986) (sequel to Alchemists)

War of the Fading Worlds

 * A Key for the Nonesuch (1990)
 * Return of the Breakneck Boys (1991) (sequel to Nonesuch)

Hook

 * Hook: A Novel for Young Readers (1992) (novelization based on the Steven Spielberg Motion Picture)

Batman

 * Mask of the Phantasm (1993) (novelization based on Batman: Mask of the Phantasm)
 * Shadows of the Past (1993) (novelization based on Batman: The Animated Series)
 * Dual to the Death (1994) (Batman: The Animated Series)
 * The Dragon and the Bat (1994) (Batman: The Animated Series)
 * Batman and Mr. Freeze (1997) (A Golden Book)

Might and Magic

 * The Dreamwright (1995) (a Might and Magic novel)
 * The Shadowsmith (1996) (sequel to Dreamwright)

Edgar Rice Burroughs Universe

 * John Carter of Mars: Gods of the Forgotten (2021) (authorized sequel to the Mars series of Edgar Rice Burroughs)