The story begins with the revelation that Seattle is being plagued by a string of unsolved murders, which Edward suspects to be the cause of a newborn vampire that is unable to control its thirst. Edward and Bella fill out college applications, while Bella explains to Edward her desire to see Jacob, her werewolf friend, again so she can make things right with him. Meanwhile, Alice Cullen has a vision that Victoria, a vampire that is hunting Bella, is back in town. Although Edward fears for her safety, Bella insists that Jacob and the rest of the werewolf pack would never harm her, but Edward is still not convinced. Bella escapes to La Push to see Jacob while Edward is away, and arrives afterwards at her house unharmed. This convinces Edward that the La Push werewolves are harmless to her and he allows Bella to visit Jacob once in a while, as long as she keeps a phone with her at all times. During one of these trips, Jacob confesses that he loves Bella and forcibly kisses her. Bella punches him which breaks her hand. When Edward finds out, he threatens to break Jacob's jaw if he ever kisses Bella without her consent again. A few days later Bella tries to get Edward to make love to her before turning her into a vampire. Edward initially refuses, explaining to Bella that he could very easily kill her. Eventually, upon realizing how much it means to Bella, he says that he is willing to try in the future as long as they are married first. Despite having an aversion to marriage, Bella realizes that spending eternity with Edward is more important to her than anything else and accepts his proposal. Bella and the Cullens realize that the murders in Seattle are being committed by Victoria and an "army" of newborn vampires that she has created. The Cullen family, abandoned by the Denali Coven, joins forces with the La Push werewolf pack in order to combat this threat. As everyone else prepares for battle, Edward and Bella camp up in the mountains, where they are later joined by Jacob and Seth Clearwater, a young member of the werewolf pack, to wait out the light. Bella, as a delicate human, starts to freeze in the harsh weather of the mountain. Jacob warms up Bella with his abnormal body heat, much to Edward's horror. During the night, Bella overhears a conversation between Edward and Jacob, in which they temporarily forget about their hatred towards each other. In the morning, Jacob overhears Edward and Bella discussing their engagement and becomes very upset. He runs off, but at Bella's request, Edward brings Jacob. He threatens to join the fight and get himself killed because he feels that Bella doesn't love him. When Bella begs him not to, Jacob insists that he will unless she asks him to kiss her. Furious, she does so, and while kissing him she realizes that she is in love with him as well. Edward finds out about this, but isn't angry. Bella realizes that she loves Edward more than Jacob.
Victoria eventually finds Bella's hiding spot, but Edward kills her while Seth kills her partner Riley. The Cullens and the Quileute werewolves, meanwhile, destroy her "army", though Jacob is injured when saving Leah Clearwater from a newborn. He heals swiftly under the supervision of Carlisle. Several members of the Volturi arrive to destroy Victoria's army, and end up only killing the one newborn who surrendered. They are also told that while Bella hasn't become a vampire yet, the date for her transformation has been set. Bella visits Jacob in his home to tell him that she has chosen to be with Edward. Heartbroken by her choice, Jacob reluctantly agrees to stop trying to come between her and Edward. Bella then goes back to Edward. They go to Alice, who already knows they're getting married. Alice has already made a number of plans for the wedding, but Bella edits some of them. After this, they go to Edward's meadow. Edward says that they can make love before marrying if she wants to, but Bella has decided to do things his way: marriage, making love, and then becoming a vampire. They then decide they need to tell Charlie about their engagement. The epilogue is told from Jacob's point of view, who is suffering from a broken heart. He receives an invitation to Bella and Edward's wedding. Inside it is a letter from Edward, thanking him for "everything," and saying that if Jacob didn't want to come, he didn't have to. Jacob, after reading the letter, runs away in his wolf form to escape the pain he feels.
Plot Summary by Wikia Entertainment