Picture this: As a child Bella was bitten by Halix a nomad Vampire who was out looking for power. He had no regard for the Volturi or their rules forbidding immortal children. She had power and that was something he sensed about her even as a human. Charlie and Rene came home to a screaming and writhing Bella, dead smack in the middle of her transformation.
They couldn't fight this man who had done the unspeakable to their daughter, the only thing they could do to save her was follow his instructions. He gave Bella an amulet that temporarily put a stop to her transformation. This was all his way of ensuring one day she would finish, and be the key to his plans. Under no circumstances was she to remove the necklace unless her life was at risk.
In fear for her future Charlie and Ranae devised a plan. Charlie was to take Bella far away and hope Halix didn't come for them, but what happens when they move to a small town called Forks and vampires already live there?