In Twilight, an exquisite fantasy by Stephenie Meyer, readers discover a pair of lovers who are supremely star-crossed. Bella adores beautiful Edward, and he returns her love. But Edward is having a hard time controlling the blood lust she arouses in him, because--he's a vampire. At any moment, the intensity of their passion could drive him to kill her, and he agonizes over the danger. But, Bella would rather be dead than part from Edward, so she risks her life to stay near him, and the novel burns with the erotic tension of their dangerous and necessarily chaste relationship.
To get a feel for it, here are a couple of links for you
http://www.twilightthemovie.com/
http://greetingsfromtwilight.com/news/news1214511337.php
This is Stephenie Meyer's own website about her books: http://www.stepheniemeyer.com/twilight.html