After breaking a promise, Harry Styles left his little sister Bo behind - just five years old at the time. Now, three years later, eight-year-old Bo is quiet, hurt, and no longer the bubbly child she used to be. Struggling with being labeled the hated Styles, her mum sends her to join Harry and the rest of One Direction on tour, hoping it might bring her out of her shell. Bo isn't sure if she can ever forgive him. But on the road, surrounded by music, chaos, and a band of big brothers who slowly become her safe place, she begins to rediscover her voice - and herself.