Olivia Reynolds and her twin brother Liam have been best friends their whole lives. But ever since he started dating, Liam has barely had time for Olivia, making her feel powerless and alone. Blaming his string of girlfriends, Olivia does whatever she can to drive them away. Until she meets Zoey, Liam's latest fling. A call-it-like-she-sees-it kind of girl, Zoey sees right through Olivia's tricks. What starts as verbal sparring turns into surprising intimacy, and then something different builds between them. Something that feels a lot like love. But when Liam confesses that he's falling for Zoey, that she's more than just a fling, Olivia has to decide who deserves happiness more: her brother or herself.