Jo lives in the same Appalachian town where her mother disappeared fifteen years ago. Everyone knows what happened to Jo's mom. She was wild, and bad things happen to girls like that. Now people are starting to talk about Jo. She's barely passing her classes and falls asleep at her desk every day. She's following in her mom's footsteps. Jo does have a secret. It's not what people think, though. Not a boy or a drug habit. Jo has a twin sister. Jo's sister is not like most people. She lives in the woods--catches rabbits with her bare hands and eats them raw. Night after night, Jo slips out of her bedroom window and meets her sister in the trees. And together they run, fearlessly. The thing is, no one's ever seen Jo's sister. So when her twin attacks a boy from town, everyone assumes that it was Jo. Which means Jo has to decide--does she tell the world about her sister, or does she run?