What is the theme in A Spell for Chameleon by Piers Anthony?

Good and Evil is a resonating theme in this story. The struggle between good and evil is apparent in most literature, and A Spell for Chameleon is no exception. What makes the author's treatment of the subject unique is the addition of the magic of Xanth. This spices up the battle for dominance between good and evil by adding an element of the unknown and unexpected. The author uses the theme to expose the good that exists in all living things, whether they appear evil or not; however, there seems to be an inherent message that appearances can be deceiving.