Howl, howl, howl, howl! O, you are men of stones . . .
Edmund leads in Lear and Cordelia as his prisoners. Cordelia expects to confront Regan and Goneril, but Lear vehemently refuses to do so. He describes a vividly imagined fantasy, in which he and Cordelia live alone together like birds in a cage, hearing about the outside world but observed by no one. Edmund sends them away, giving the captain who guards them a note with instructions as to what to do with them. He doesn’t make the note’s contents clear to the audience, but he speaks ominously. The captain agrees to follow Edmund’s orders.
Albany enters accompanied by Goneril and Regan. He praises Edmund for his brave fighting on the British side and orders that he produce Lear and Cordelia. Edmund lies to Albany, claiming that he sent Lear and Cordelia far away because he feared that they would excite the sympathy of the British forces and create a mutiny. Albany rebukes him for putting himself above his place, but Regan breaks in to declare that she plans to make Edmund her husband. Goneril tells Regan that Edmund will not marry her, but Regan, who is unexpectedly beginning to feel sick, claims Edmund as her husband and lord.
Albany intervenes, arresting Edmund on a charge of treason. Albany challenges Edmund to defend himself against the charge in a trial by combat, and he sounds the trumpet to summon his champion. While Regan, who is growing ill, is helped to Albany’s tent, Edgar appears in full armor to accuse Edmund of treason and face him in single combat. Edgar defeats Edmund, and Albany cries out to Edgar to leave Edmund alive for questioning. Goneril tries to help the wounded Edmund, but Albany brings out the treacherous letter to show that he knows of her conspiracy against him. Goneril rushes off in desperation.
Edgar takes off his helmet and reveals his identity. He reconciles with Albany and tells the company how he disguised himself as a mad beggar and led Gloucester through the countryside. He adds that he revealed himself to his father only as he was preparing to fight Edmund and that Gloucester, torn between joy and grief, died.
A gentleman rushes in carrying a bloody knife. He announces that Goneril has committed suicide. Moreover, she fatally poisoned Regan before she died. The two bodies are carried in and laid out.
Kent enters and asks where Lear is. Albany recalls with horror that Lear and Cordelia are still imprisoned and demands from Edmund their whereabouts. Edmund repents his crimes and determines to do good before his death. He tells the others that he had ordered that Cordelia be hanged and sends a messenger to try to intervene.