"Audrey St. Vrain has grown up in the shadow of someone who doesn’t actually exist. Before she was born, her mother, Camilla St. Vrain, wrote the bestselling book Letters to My Someday Daughter, a guide to self-love that advises treating yourself like you would your own hypothetical future daughter. The book made Audrey’s mother a household name, and she built an empire around it. While the world considers Audrey lucky to have Camilla for a mother,...