After five years of marriage, Diana discovers the joys of adultery, claiming that she can save her failing relationship through betrayal.

The king desires nothing more than a male heir. But his wife gives birth to a girl Fantaghiró. When she refuses to marry years later, she is sent in the forest where she learns how to ride and fight like a man. She appears disguised in a duel with Prince Romualdo, the son of her father's adversary. Both fall in love, but their marriage brings no peace to the united kingdom. Evil forces are trying to seize power.

In the middle of a war between two kingdoms queen died tragically while giving birth to her third daughter. The king wanted a male heir to his throne and torn by the death of his wife, decides to sacrifice the girl and leads to the Cave of the Golden Rose to give her to the monster. The child is saved by the White Witch who promises her a wonderful future. With a rebellious temperament, the princess, named by his father Fantaghiro behaves like a tomboy. But one day she must confront the enemy, the king Romualdo, which is in love with her.

15-year-old Giuliana doesn't want to spend the summer with her rich mother, so—without a word—she leaves with Romeo, the son of the janitor of her building, embarking on a backpacking trip through Italy. Her divorced father is worried and decides to go in search of his daughter.