Claire Can't Lose — Katherine Applegate

They've all grown up together on a tiny island. They think they know everything about one another...but they're only just beginning to find out the truth. Claire can't lose in the game of love. For once she's found her soul mate-a manipulative schemer just like her. And she'll do whatever it takes to make Aaron forget Zoey forever.
Zoey still can't choose between Aaron and Lucas, so Aaron asks Claire's advice on how to win Zoey's heart for good. But Claire wants Aaron for herself. If he's crazy enough to follow her advice, then Claire can't lose.