Mia Horan Is Niall Horan's Twin Sister. When Niall Joins One Direction, She gets to meet them . Her Dream Is To Become A Singer Or Dancer, With Her best Friends Emily And Jennifer. But What Happens When You Spend One Afternoon With A Boy Like Harry Styles? Do You End Up Having Feelings For Him? And What Happens When Your Little Brother Metal's With Your Relationship? Do You Forgive Him? There's Alot Of Twist's And Turns In This Story.