My name is Isabella Butterworth. Your name is Isabella Butterworth. We're around the same age. We live in the same town. But your life is more exciting than mine, isn't it? Richer, dramatic, more fulfilling. Imagine if I'd never found out about you... But I have. Because someone mistook me for you. And now I can't stop thinking about you because I know you're in trouble. You need my help. And I need a way to get to know you. To save you. To be you... The unputdownable new thriller from Nell Pattison that will turn everything you thought you knew on its head...perfect for fans of Ruth Ware and Lisa Jewell.