Megan, a small town girl eager to escape her Midwestern roots, and Lauren, an elite New Englander stemming from the Mabrey political family, become best friends and roommates when they go away to college. However, from the first few pages, we can see that something has gone very wrong in their past and has altered the course of their friendship. As the girls become more like sisters, they continue constantly trying to impress each other. When Megan stays at the Mabrey family's island for the summer, something mysterious happens that rips them apart. It takes most of the book to get the real story about what happened on the island, and while it wasn't hard to guess, the author did a great job of building up the tension and not making it obvious. While I consider myself to typically be able to figure out a twist, I actually made some incorrect assumptions which made me have to go back and reread a little. While I wasn't completely satisfied with the end, it was realistic, which is refreshing.