On her seventeenth birthday, Sera Nightshade receives a letter written in her own blood and discovers she's a Dual-Born, part vampire and part werewolf, the thirteenth of her kind. All twelve before her died before nineteen. Now enrolled at Bloodmoon Academy, where ancient enemies share uneasy halls, Sera has six months to make an impossible choice: one kiss will lock in her nature forever, and choosing wrong will destroy her. Caught between a brooding vampire prince, a fierce werewolf alpha, and a school that wants to claim or kill her, Sera must figure out who she is before the magic decides for her.