Edgar has led his blinded father to Dover, still pretending to be 'Poor Tom' although Gloucester recognises that his guide's 'voice is altered'. Despite Gloucester also recognising that 'the ground is even', Edgar convinces him that they are at the top of a high cliff from which 'The fishermen that walk upon the beach /Appear like mice'. Gloucester sends his guide away with 'another purse'.
When Gloucester falls forward, believing he is throwing himself from the cliff top, Edgar confesses that his plan may 'may rob / The treasury of life' and rushes to his father to check if he is still alive. He now pretends to be a passer by on the beach who saw the old man fall and declares 'Thy life's a miracle'. Gloucester agrees to 'bear / Affliction till it do cry out itself /'Enough, enough' and die.'
At that moment King Lear joins them, behaving very oddly and ranting about his daughters. Gloucester recognises the king's voice. Lear comments on Gloucester's lack of eyes and tells him 'A man may see how this world goes with no eyes. / Look with thine ears'.
Lear finally admits, 'I know thee well enough: thy name is Gloucester' before running off, chased by three gentlemen sent to calm him down and take him to Cordelia. Edgar learns from one of the gentleman that the opposing army are 'Near and on speedy foot'.
Edgar tells Gloucester he is 'A most poor man, made tame to fortune's blows' and begins to lead him to shelter when Oswald appears, ready to kill Gloucester. Edgar defends Gloucester and kills Oswald who dies believing Edgar is a 'bold peasant'. He gives Edgar his purse and tells him to 'bury my body / And give the letters which thou find'st about me / To Edmund, Earl of Gloucester'.
Edgar reads aloud the letter from Goneril to Edmund which asks