Fashion designer Rüdiger falls in love with Italian countess Vera, who was injured by him in a car accident. Just before their wedding they find out they are brother and sister. The wedding is cancelled, and Vera returns to Florence in a state of shock.

The young knight Tristan is injured in a fight in Ireland and cared for by the beautiful Isolde. He falls in love with her, unaware that she is the daughter of the Irish king.