When Kori Kitlzer, the "dark angel" of the 8th grade, tells Serena Moore that they are more alike than she thinks, Serena is instantly intrigued.#xA0; As their friendship solidifies and their lives entwine, Serena tries to become more like the fearless, outspoken, and ambitious Kori. Soon Serena doesn't know where she begins and Kori ends. But when a twist of fate yanks Kori away from Serena, she will need to find a way to complete her best friend's life left undone.#xA0; Undoneis a striking debut novel about friendship, family, and the secrets we keep from the people to whom we are closest.