Is it possible and permissible to bend oneself for love?
Her friends call her Jack. The men she has amorous adventures with do as well. She is charming, she is flighty, and she can hardly count the hearts she has already broken. Jacqueline Mamroth is simply made for a free life – until she meets Michael Thomas. He is the first man she seriously falls in love with. However, he is old-fashioned, has strict morals, and only likes women who are the exact opposite of Jack: innocent and demure. Since she has a certain reputation in Paris, London, and Berlin, Michael would never fall in love with her if she revealed her true identity to him. Jack persuades her shy younger sister June to take on the role of Jack and presents herself to Michael as a woman of impeccable conduct. From then on, she is demure. They get together. But who is Jack now? And what happens when her sister and Michael meet?