Arthur knows something is going on between Lancelot and Guenevere, but he cannot bring himself to accuse them because he loves them both. He decides to rise above the scandal and ignore it. However, Mordred, Arthur's illegitimate son from an affair with the Princess Morgause before he was crowned, arrives at Camelot bitter because Arthur will not recognize him as son and heir. Mordred is determined to bring down the fellowship of the Round Table by stirring up trouble. All this takes its toll on Arthur's disposition, and Guenevere tries to cheer him up ("What Do the Simple Folk Do?") despite her conflicted emotions.
Mordred cunningly convinces Arthur to stay out hunting all night as a test, knowing that Lancelot will visit Guenevere in her bedchamber. Everything happens as Mordred expected, except that Lancelot and Guenevere had intended to make this visit the last time they will see each other. They sing of their forbidden love and how wrong it has all gone ("I Loved You Once In Silence"). But Mordred and several knights are waiting behind the curtains, and they catch the lovers together. Lancelot escapes, but Guenevere is arrested and sentenced to die by burning at the stake, thanks to Arthur's new civil court and trial by jury. Arthur, who has promoted the rule of law throughout the story, is now bound by his own law and cannot spare Guenevere. "Kill the Queen or kill the law," says Mordred. Preparations are made for Guenevere's burning ("Guenevere"), but Lancelot rescues her at the last minute, much to Arthur's relief. However, many knights are killed, and the knights demand vengeance.
The plot returns to the opening. Arthur is preparing for battle against Lancelot, at the insistence of his knights who want revenge, and England appears headed back into the Dark Ages. Arthur receives a surprise visit from Lancelot and Guenevere, at the edge of the woods, where she has taken residence at a convent. Lancelot asks if there is nothing to be done, but Arthur can think of nothing but to let the events ride out. They clasp arms in farewell, and Lancelot leaves. Arthur and Guenevere share an emotional farewell, his heart breaking when he sees that she has had all her glorious hair chopped off. She is beside herself that she may never see him again or know his forgiveness.
Prior to the battle, Arthur stumbles across a young boy named Tom, who wishes to fight in the battle and become a Knight of the Round Table. Tom espouses his commitment to Arthur's original ideal of "Not might 'makes' right, but might 'for' right." Arthur realizes that, although most of his plans have fallen through, the ideals of Camelot still live on in this simple boy. Arthur knights Tom and gives him his orders—run behind the lines and survive the battle, so that he can tell future generations about the legend of Camelot. Watching Tom leave, Arthur regains his hope for the future ("Camelot (reprise)").
This post was edited by WM BARR . =ABSOLUTE TRASH at November 2, 2019 9:18 AM MDT