There's a new student at Nora Grey's school, and when he is assigned as her biology partner, she's both intrigued and scared by him. She begins to have visions of her own death, terrifying episodes that turn out to be nothing - other than embarrassing to explain when she calls the police. When another new student and his friend begin showing interest in Nora, she doesn't know who to trust, or who is trying to hurt her.
The Nephilim are the children of human mothers and fallen angel fathers. They have certain abilities, and they are usually not particularly nice. I've always been interested in that mythology, so that part of the book appealed to me. And the attraction between Nora and Patch - she can't stay away from him even though she's pretty sure he's dangerous - was fun, if kind of disturbing. The end of the book was kind of confusing, since I'm not sure how the situation (though different) is any better than it was at the beginning of the book.