Macbeth embarks on a reign of terror and many, including Macduff’s family are murdered, while Macduff himself has gone to join Malcolm at the court of the English king, Edward. Malcolm and Macduff decide to lead an army against Macbeth.
Macbeth feels safe in his remote castle at Dunsinane until he is told that Birnam Wood is moving towards him. The situation is that Malcolm’s army is carrying branches from the forest as camouflage for their assault on the castle. Meanwhile Lady Macbeth, paralysed with guilt, walks in her sleep and gives away her secrets to a listening doctor. She kills herself as the final battle commences.
Macduff challenges Macbeth who, on learning his adversary is the child of a Ceasarian birth, realises he is doomed. Macduff triumphs and brings the head of the traitor to Malcolm who declares peace and is crowned king.