Twilight, by Stephenie Meyer, is a love story. With vampires in it.
And before your nose can finish turning up at that description, I just have to mention how wholly addicting it is. Go ahead. Bet you can't read it just once. Here's a review from Amazon:
Meyer adds an eerie new twist to the mismatched, star-crossed lovers theme: predator falls for prey, human falls for vampire. This tension strips away any pretense readers may have about the everyday teen romance novel, and kissing, touching, and talking take on an entirely new meaning when one small mistake could be life-threatening. The novel's danger-factor skyrockets as the excitement of secret love and hushed affection morphs into a terrifying race to stay alive. Realistic, subtle, and succinct, Twilight will have readers dying to sink their teeth into it.
–Hillias J. Martin, New York Public Library