Twilight by Stephenie Meyer is a great book that you must read. It is about a 17 year old girl, Bella Swan. She meets mysterious Edward Cullen. There's something about him, which could ruin their lives. He is a vampire. And they're in love.
Also read New Moon and Eclipse, the sequels to this great series. And Breaking Dawn, is coming out soon.
I recommend you read them in order otherwise you won't understand a thing.