Everyone in Tuan is excited about the wedding of Fantaghiro and Romualdo that is about to be held. Hadrian gives Fantaghiro his most treasured jewel, the Red Diamond, and tells her about the amazing and mysterious way in which it reached him. Fantaghiro is spellbound by the jewel’s beauty and senses that it conceals many secrets.That same night, the Red Diamond radiate its powers and the witch Dahak awakens in her lair with evil joy. For centuries, she has unsuccessfully tried to take possession of the Red Diamond and this time she is unwilling to fail. Dahak departs for Fantaghiro’s Castle to threaten the princess if she does not hand over the diamond...