Rylee Devine is the little sister of One directions drummer Josh Devine. After an accident resulting in a loss of her parents, she is taken in by her brother and the band. As the spend the summer together, one of the boys finds himself falling for her, but will he break the 'Sister Rule' even if it means risking a friendship?

Daniella is Harry Styles sister. She has been away from the band and her brother for four years. Her life without them, was hard. She has spent all her time hiding her scars. She came from a world of abuse and hate, all from her father. But when she finally goes back to living with her brother and the band, will everything go the way she planned, or will her past come crashing down on her, so hard that she doesn't stand a chance?