Always classy, never trashy, and VERY sassy. Cassidy and Niall Horan are twins. She and Niall are very close, so when Niall are moving from Mullingar to London to live with his other bandmates in the world famous boyband One Direction, Cassidy is left heartbroken. A few years later her mom and dad are tired of her sassy attitude, so they decide that she's moving to London to live with Niall...and the rest of One Direction. Cassidy hates the other boys in One Direction, 'cus in Cassidys head they stole Niall away from her. But how is she supposed to hate those kind, funny and loving boys? And when she even falls in love with one of them, how will she be able to handle it when her overprotective twinbrother says she can't date him? Add some big dreams and a lot of sassiness, then you have the life of Cassidy Horan.