AM

Scott McCall has spent his life believing he knows exactly what his family is—until the arrival of his twin sister, a girl who has always been different. Born with a supernatural power that predates every known werewolf lineage, she carries something ancient inside her, a form of lycanthropy so old that even the supernatural world has forgotten it ever existed. When violent attacks begin tearing through Beacon Hills, leaving bodies behind and drawing the attention of hunters, alphas, and creatures Scott never knew existed, her secret starts to surface. Stiles Stilinski is the first to notice that there is something terrifyingly wrong with her, but instead of running, he becomes determined to understand her—even as his growing feelings for her put him directly in the path of danger. As the twins are dragged into a war between supernatural forces, she begins losing control of the ancient wolf within her, suffering visions, nightmares, unexplained injuries, and terrifying blackouts that leave her questioning whether she is still herself. With every attack, the line between protecting the people she loves and becoming the very monster they fear grows thinner, while Stiles struggles to keep her grounded as he watches the girl he loves slowly destroy herself. Secrets about her birth, her family, and the true origin of her power begin to emerge, revealing that her existence may not be an accident—but a warning. And when something ancient awakens beneath Beacon Hills, Scott must choose between saving his sister and stopping the creature she may have been born to unleash, while Stiles risks everything to bring her back before the darkness inside her becomes permanent.