Bella Swan (Kristen Stewart) and Edward Cullen (Robert Pattinson) are completely in love. Edward is traditional and generous, and no matter how much Bella likes to keep things on the down-low, he wants to celebrate her birthday with his entire family.
However, there's always a risk when Bella visits the Cullens. Although they don't consume human blood, it's still tempting for them, and Edward's brother Jasper most of all. Not because he's a new vampire, but because he's a recent addition to the Cullen family, who limit themselves to animal blood. Before that, he feasted on hundreds of humans. The temptation is still strong for him.
Bella is opening her gifts from the Cullens when a minor mishap occurs. Well, it would be minor for most people, in normal situations. She gets a paper cut from the wrapping paper on one of the presents. Jasper flies out of control at the scent and sight of her blood, and although he's restrained by the others, it's an upsetting experience.
For Bella, even more so when Edward begins to withdraw from her. He becomes more and more distant and when he makes an abrupt departure, she feels as if her heart is broken—no, more than broken - ripped from her chest. There's an empty feeling and she’s not sure she'll ever feel whole again.
To placate her father, and in an attempt to seem as if she’s back to normal, Bella starts hanging out with Jacob, a friend from the nearby reservation. The question arises—could Jacob ever take Edward's place in Bella's heart?