With her mom, Renee (SARAH CLARKE), remarrying and going on the road with her minor league baseball player husband, 17-year-old Bella Swan (KRISTEN STEWART) is relocating from her home in Phoenix to the small town of Forks, Washington to live with her single dad, Charlie (BILLY BURKE), the local chief of police.
Bella isn't pleased to be the new kid in school, especially since her childhood friend, American Indian Jacob Black (TAYLOR LAUTNER), goes to school on the reservation. Even so, a number of students, including Mike Newton (MICHAEL WELCH), Jessica Stanley (ANNA KENDRICK) and Angela Weber (CHRISTIAN SERRATOS) quickly befriend their new classmate and give her the lowdown on a family of students who pretty much keep to themselves.
Foster kids to local physician Carlisle Cullen (PETER FACINELLI) and his wife Esme (ELIZABETH REASER), they include the oldest kids, Rosalie (NIKKI REED) and Emmett (KELLAN LUTZ), outgoing Alice (ASHLEY GREENE) and the seemingly wound-too-tight Jasper (JACKSON RATHBONE).
Then there's strikingly handsome Edward (ROBERT PATTINSON), who initially seems repulsed by Bella and her scent, but secretly finds her quite alluring. That's because he, like the rest of his family, is a vampire, forever stuck at the age of his initial transformation. And like the others, he's learned to resist his appetite for human blood and instead feeds only on animals.
He and Bella eventually become friends and then something more, even when he tries to tell her he's not right for her, without revealing his secret. By the time she eventually figures it out, she's so head over heels in love with him that she doesn't care, although she obviously can't give her dad or mom -- to whom she talks on the phone -- all of the details.
Of bigger concern than their unlikely mixed relationship, however, is the fact that a trio of rogue vampires -- James (CAM GIGANDET), Victoria (RACHELLE LEFEVRE) and Laurent (EDI GATHEGI) -- have recently arrived and are killing and feeding on the locals. Not only does that threaten to reveal the Cullens' secret, but it also means that Bella's life might be in danger, especially once James gets a whiff of her alluring scent.