The male circle of the Grail Knights is in crisis. Time and again, knights desert to the counter-realm of the sorcerer Klingsor, who had previously been rejected by the circle of knights. With the help of seductive women, above all Kundry, he succeeds in bringing down the knights. He is even able to tempt the Grail King Amfortas into a misstep. He steals his sacred spear and inflicts an incurable wound. As a result, Amfortas' ritual duty of unveiling the Grail has become an ordeal. Only a pure fool is destined to undo the Grail King's fall from grace and reverse its devastating consequences.