Lucy’s always looked up to her big sister, Olivia, even though the two are polar opposites. But then, Lucy notices that Olivia has started to change. She doesn’t want to play with Lucy anymore, she’s unhappy with the way she looks, and she’s refusing to eat her dinner. Finally, Lucy discovers that her sister is not just growing up: Olivia is struggling with an eating disorder.

While her family is focused on her sister’s recovery, Lucy is left alone to navigate school and friendships. And just like her big sister, she begins to shrink. But with time, work, and a dose of self-love, both sisters begin to heal and let themselves grow. Soon enough, Olivia and Lucy find their way back to each other—because sisters are the one friend you can never ditch.