Haven was not the greatest book in the world. It pretty much is like Twilight, except it takes place in a boarding school, and everyone there has psychic abilities. Violet (the main character) was slightly boring, and at times did really stupid things (like Bella). Aidan...... (view spoiler)[ he is pretty much Edward, except that he had a girlfriend about 100 years before Violet came around, who died because Aidan was discovered to be a vampire, and the towns people killed her. We later find out that Violet looks exactly alike Isabel, but Aidan apparently does love her, not becuase she looks like Isabel, but because she is herself. (hide spoiler)] 
 There were a couple of differences from this book and Twilight. Because of the fact that they all have psychic abilities (view spoiler)[ (including Aidan, who can run at the speed of light, has amazing strength, eternal youth, and read minds. *cough Edward cough*) (hide spoiler)] Violet can see into the future *cough Alice cough* and can tell when someone she cares about is going to be harmed. And throughout most of the book, she has a vision of Aidan supposidly dieing at her hand. (view spoiler)[ We also later find out that Violet is a Sabbat, which is the pretty much a vampire slayer *cough Buffy cough* which gives the relationship she has with Aidan even more problems. In addition to this, Aidan is trying to figure out a "cure" to make it so he doesn't have to be a vampire. Which, admittadly, I thought was pretty cool. (hide spoiler)] 
 There were a couple of things I did not see coming (view spoiler)[ Jenna is a werewolf, which surprised me, because I initially thought that she was going to turn out to be another vampire, like Aidan, but Blackwell and Mrs. Girard took care of that one. I also didn't see Isabel looking exactly like Violet, and Violet being a vampire slayer, coming, so those were entertaining. (hide spoiler)] 
 Overall, I would recommend this book for people who like Twilight.