Just when Summer Torres thought life in Shorehaven had finally settled, a regional surf competition introduces a face she never expected to see—her younger sister, Erin. Fearless in the water and impossible to ignore, Erin quickly earns the attention of the local surf scene, proving she's far more than Summer's little sister. As rivalries ignite, friendships are tested, and an unexpected connection with Bax begins to grow, Erin must carve out her own place in Shorehaven while discovering that the biggest waves aren't always in the ocean.