Aniana del Mar belongs in the water like a dolphin belongs to the sea. But she and Papi keep her swim practices and meets hidden from Mami, who has never recovered from losing someone she loves to the water years ago. That is, until the day Ani's stiffness and swollen joints mean she can no longer get out of bed, and Ani is forced to reveal just how important swimming is to her. Mami forbids her from returning to the water, but Ani and her doctor believe that swimming along with medication will help Ani manage her disease. What follows is the journey of a girl who must grieve who she once was in order to rise like the tide and become the young woman she is meant to be.