Eager, burning, and young, Alexander has come of age to take vengeance on the treacherous King of Cornwall who murdered his father. He sets off toward Camelot to seek justice from King Arthur, only to be diverted by the beautiful and sensual Morgan le Fay, Arthur's sister. Using her wiles and her enchantments, Morgan persuades the young prince to attempt a theft of the Holy Grail. He is unaware her motives are of the darkest nature.