Twilight by Stephanie 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.

When Bella Swan moves to the gloomy town of Forks and meets Edward Cullen, her life takes a thrilling and terrifying turn. With his porcelain skin, golden eyes, mesmerizing voice, and supernatural gifts, Edward is both irresistible and impenetrable. Up until now, he has managed to keep his true identity hidden, but Bella is determined to uncover his dark secret.

What Bella doesn't realize is the closer she gets to him, the more she is putting herself and those around her at risk. And it might be too late to turn back...