Who's That Girl? is a captivating historical fiction novel written by Melissa de la Cruz. Set in the glamorous world of 1920s New York City, the book follows the story of Genevieve Dumont, a young woman who becomes entangled in a web of secrets and scandal. As Genevieve navigates through the glitzy parties and dangerous underworld of the city, she discovers shocking truths about her family and herself. With its richly detailed setting and compelling characters, Who's That Girl? offers a thrilling glimpse into the Roaring Twenties.