Twilight (Twilight Saga #1) by Stephenie Meyer
About three things I was absolutely positive.
First, Edward was a vampire.
Second, there was a part of him—and I didn't know how dominant that part might be—that thirsted for my blood.
And third, I was unconditionally and irrevocably in love with him.
Deeply seductive and extraordinarily suspenseful, Twilight is a love story with bite.