Breaking Dawn by Stephenie Meyer

In the explosive fourth book in the epic romantic saga, Bella has one final choice to make. Should she stay mortal and strengthen her connection to the werewolves—or leave it all behind to become a vampire?

When you loved the one who was killing you, it left you no options. How could you run, how could you fight, when doing so would hurt that beloved one? If your life was all you had to give, how could you not give it? If it was someone you truly loved?

To be irrevocably in love with a vampire is both fantasy and nightmare woven into a dangerously heightened reality for Bella Swan. Pulled in one direction by her intense passion for Edward Cullen, and in another by her profound connection to werewolf Jacob Black, a tumultuous year of temptation, loss, and strife have led her to the ultimate turning point. Her imminent choice to either join the dark but seductive world of immortals or to pursue a fully human life has become the thread from which the fates of two tribes hangs.