Eclipse by Stephenie Meyer

Eclipse is the third novel in the Twilight Saga by Stephenie Meyer. It continues the story of Bella Swan and her vampire love, Edward Cullen. The novel explores Bella's choice between her love for Edward and her friendship with shape-shifter Jacob Black, along with her dilemma of leaving her mortality behind in a terrorized atmosphere, a result of mysterious vampire attacks in Seattle.
Eclipse is preceded by New Moon and followed by Breaking Dawn.
The story opens with the revelation that Seattle, Washington is being plagued by a string of murders, which Edward suspects is caused by a new vampire that is unable to control its thirst for human blood. As Edward and Bella apply to colleges, Bella explains to Edward her desire to see her friend, Jacob Black, a werewolf. Although Edward fears for her safety, Bella insists that neither Jacob nor his wolf pack would ever harm her, and she begins visiting him occasionally. On one of these visits, Jacob tells Bella that he is in love with her, and wants her to choose him instead of Edward, but Bella says she just sees him as a friend. To that, Jacob forcibly kisses her and she reacts by punching him in the face, breaking her hand while not even leaving a scratch on him. Meanwhile, Alice Cullen has a vision that Victoria, a vampire who is hunting Bella for revenge, has returned to Forks. A few days later, Edward proposes to Bella and, despite harboring an aversion to marriage, she accepts... (Summary by Wikipedia)