Beautiful Creatures Book Series, First Three Books, Kami Garcia, Margare…

A 16-year-old Ethan Wate lives in Gatlin, South Carolina, with his widowed father. Lena Duchannes is a mysterious girl with magical powers who appears in Ethan's recurring nightmares. Though she initially rebuffs his attempts at interacting with her, they eventually become friends despite harassment from other classmates that almost gets her expelled. Lena's uncle Macon Ravenwood also attempts to keep Ethan and Lena apart to protect them. Every member of Lena's family is a "Caster" with magical powers. On Lena's 16th birthday, she will be "claimed" as either a Light or Dark Caster, but she is terrified of becoming an evil Dark Caster. First three books of the series - Beautiful Creatures (paperback), Beautiful Darkness (hardcover), Beautiful Chaos (hardcover).