Bella's parents never split up, Renee never followed her dreams and escaped Forks. Thus, Bella has grown up in a constantly overcast small town with a police chief father and a mother who's checked out emotionally.  She's still the straight A student whose never met a boy who peaked her interest but she did find other ways to escape her suffocating life. 

Edward and the Cullens move back to Forks as they did previous to the first novel, only Bella is already there.  Edward is still a vampire with an Edwardian man's sensibilities, and he's still drawn inexorably to Bella, despite her pasttimes. 

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