Rushdie has written a sequel to Haroun and the Sea of Stories called Luka and the Fire of Life. The author’s many other novels are intended for adult readers.
A play version of the novel written by Tim Supple and David Tushingham, also called Haroun and the Sea of Stories, adapted the story for the theater.
Also consider One Thousand and One Nights (sometimes called Arabian Nights), a famous collection of middle eastern folktales that Rushdie draws upon in Haroun. Consider Alice’s Adventures in Wonderland by Lewis Carroll and The Wizard of Oz by L. Frank Baum for additional phantasmagorical fiction.