New Moon by Stephenie Meyer
New Moon starts off with immediate suspense and Bella is put in danger. Wanting to protect her, Edward decides that his presence is what puts Bella at risk and so he leaves town. Bella slides into a deep depression and the only thing that saves her is her friendship with Jacob, a boy from the local reservation. Jacob is also a werewolf, the archnemesis of vampires.
I think New Moon is my favorite book of the series. I've heard people say that they don't like it because Edward isn't it in as much, but that didn't really bother me. Probably because of that amazing character development of Stephenie Meyer's. Bella's depression was crucial to my understanding of how much she loved Edward and how imperative he is in her life (otherwise, the events and declarations in Book 3 would have seemed a little false). What really struck me was the use of white space on the page to show not only the passing of time but also Bella's bleak outlook. Pages 85-92 simply contain one word on every other page: October, November, December, and January. And then the next chapter is titled "Waking Up" and consists of 5 sentences starting with "Time passes". It's such a bleak and desperate few pages. I have only one word for this - GENIUS.
My review of Twilight
My review of Eclipse