Belly has spent every summer of her life at Cousins Beach with her mother’s best friend and her two sons, Conrad and Jeremiah. For years, she felt like just a little girl, but this summer is different because she has finally grown up. As the sun shines and the waves crash, Belly finds herself caught in a complicated relationship with the two brothers she has known forever. It is a sweet and emotional story about first love, the magic of summer, and the difficult but beautiful journey of growing up.