After Mia is unexpectedly dumped by Jake, a summer having fun and relaxing with her family in the Hamptons sounds like the perfect beach escape. But her cousin Corinne’s new elitist attitude is definitely not what Mia was expecting, and neither is all the family drama. Mia starts to feel more like an outsider than ever before. Enter Simon, the boy staying next door. He’s adventurous, quirky, smart, and seems to want to get to know Mia. And he’s definitely not part of Corinne’s “cool” crowd. His lively spirit starts to rub off on Mia, and she finally begins to open up—including sneaking out, taking late-night walks on the beach, and maybe even falling love. The summer might just turn out better than she had originally planned. But coming out of her shell could mean losing everything Mia has gained.