I am giving you a longer, better summary because it is hard to explain and get my point across with a little short summary.
Long Summary: Bella and the Cullens leave Forks and end up in the town of Mystic Falls, Virginia, where they find two brothers in a rivalry. These brothers have lived years hating each other only to find that they both love one girl. Which brother does the pretty brunette girl choose and what happens to the other brother? And how do the Cullens play into the story? Well, read to find out, I'm not giving it away.
Preface
"Bella, we have to move."
"But, Edward, I like this cottage and I want to raise Nessie here with Charlie close by. And that brings me to, what are we going to tell dad?"
"Your dad will understand, Love. And Nessie will be fine. We have stayed here too long as it is and we don't need to raise suspicion."
"Oh, fine. But where are we going?"
"You, Nessie, and I are staying with a friend of mine that I met a while back. He has a human girlfriend so we have to be careful. And his brother is slightly . . . dangerous.
"These vampires are different than us. They come from a different beginning, a different starting point than we did."
"How different?"
"They were given a Power known as compulsion. They can make you do, or even say, anything they want just by looking into someone's eyes. They can . . . compel you to do things that you may have never thought about doing."
Edward was holding Bella's hand and squeezed it as if to warm her.
"So they can't affect me with it?"
"It's not something a shield can protect you from, Bella. The only thing that can protect you is vervain."
"I'll be fine, Eddy. Don't worry about me."
"I promise I won't worry. I know you are too strong to let this difference affect you."
They gave a quick hug around each others waist and began hunting.