The Stonebreaker

The Stonebreaker (a YA fantasy novel)

In this origin story, Gryffin, a junior high school girl and aspiring politician aims to be class president, but as a demonic force slowly possesses her body, limb by limb, and coerces her to be attracted to evil things, she and her friends must find a way to reverse its power and then the solve the mystery of the missing kids.