In Seattle, not far from Forks, Victoria attacks and bites Riley Biers, in order to begin creating an army of newborns, who are many times stronger during their first few months than older vampires. Back in Forks, Edward Cullen and Bella Swan discuss the complications of becoming an immortal vampire. At 18 years old, one year older than Edward was when he became a vampire, Bella expresses her dislike to the idea of marrying so young, though Edward refuses to turn her into a vampire until they are married, his argument being that she should have various human experiences she would otherwise miss. While Charlie Swan investigates the disappearance of Riley Biers, Edward suspects his disappearance was caused by Victoria and her newborn’s army, furthering his suspicions is Riley’s intrusion into Bella’s room.
Bella insists that Jacob Black and the rest of the werewolf pack would never harm her. Bella wants to go to Jacob’s home even though Edward expresses his dislike and concern for her safety, but she returns unharmed. During one of her visits, Jacob confesses that he is in love with Bella, and forcefully kisses her. Furious, she punches him and sprains her hand, and Edward later threatens Jacob and tells him to only kiss her if she asks him to. Bella even revokes the invitations of Jacob and his pack members to her graduation party, but when Jacob apologizes for his behavior, she forgives him.
Meanwhile, Alice sees a vision that the newborn army will attack Forks within the week, led by Riley Biers. Jacob, accompanied by Quil and Embry overhear this, which leads to an alliance between the Cullens and Wolf pack. Later, the Cullens and the wolves agree to a meeting place and time to train and discuss strategy against the powerful newborns. During the training Jasper explains to Bella that he was created by a vampire named Maria to control a newborn army. He hated his original existence until he met Alice and joins in Cullens gang. Bella sees the true bond between a mated vampire pair and begins to understand Jasper better. Despite her reluctance to marry, Bella realizes that spending eternity with Edward is more important to her than anything else and agrees to marry him. Edward and Bella camp in the mountains to hide Bella from the bloodthirsty newborns. During the night, Bella overhears a conversation between Edward and Jacob, in which they temporarily put aside their hatred towards each other. In the morning, Jacob overhears Edward and Bella discussing their engagement and storms off, angrily. Bella desperately asks Jacob to kiss her, and she realizes that she has fallen in love with him. Edward finds out about the kiss but is not upset, as Bella says she loves him more than Jacob.