Lucy's always looked up to her big sister, Olivia. But then, Olivia starts to change and Lucy discovers that her sister is not just growing up: she's struggling with an eating disorder. Lucy has always looked up to her big sister, but now with her family focused on helping Livvy, Lucy has to figure out middle school, making friends, and dealing with a mean classmate all on her own. But with time, work, and a dose of self-love, both sisters begin to heal. Soon enough, Olivia and Lucy find their way back to each other-because sisters are the one friend you can never leave behind.