Lily Tomlinson is the younger sister of Louis Tomlinson. She's always been quite the rebel but after a run in with the police her parents are sick of it so she gets the choice, either she stays home all summer or she goes live with her brother that she doesn't really get along with at all. She choses the second choice, just to annoy Louis really. But what happens when she meets the rest of the band, will she change her ways and will love grow? Or will things only get worse?