Sybille, a rebellious girl, bets a publisher that she can write an erotic masterpiece. Reading her work, he agrees and contracts to publish her book, promising that she can be anonymous. Sybille's chief problem is that she is a virgin. So she undertakes lots of "research," observing others and finally seducing her publisher. The book is a best seller - and he betrays her - intimating he was instrumental in the writing of the book and dumping her for her older sister. And of course, she's hopelessly in love with him. So she plays a trick to get him back.