Here's the Summary from Barnes and Noble:
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. 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. Undone is a striking debut novel about friendship, family, and the secrets we keep from the people to whom we are closest.
Here's the book trailer:
Anyway, if you would like to win this book Reviewer X is holding a contest and so is Brooke Taylor who is also giving away other books with Undone.
I will be posting the review as soon as I get it from Amazon!!