Nea (1976)

In Genève, bookseller and publisher Axel Thorpe catches willful, rich 16-year-old Sibylle Ashby shoplifting. She brags about her writing, so he challenges her to produce a book. She writes an erotic novel that Thorpe publishes anonymously, and it becomes a best seller. She also tries to capture the love of this 40-year-old publisher but he drops her for her older sister.