Kate Fitzgerald was diagnosed with leukemia at a young age and her family's lives revolved around caring for her. Her parents Sara and Brian had another daughter, Anna, in hopes she could donate bone marrow to help Kate. However, as she grew older, Anna sued her parents for her medical autonomy. The movie follows Kate's illness and relationship with Taylor, another leukemia patient she meets in the hospital, as well as the strain it places on her family members like Jesse and the conflict with Anna.