ACT I
Scotland. Macbeth and Banquo, leaders of the Scottish army, meet a group of witches who prophesy the future. They address Macbeth as Thane of Cawdor and King of Scotland, and tell Banquo that he will be the father of kings. The two men try to learn more, but the witches vanish. Messengers arrive with news that Duncan, the current king of Scotland, has made Macbeth Thane of Cawdor. The first part of the witches’ prediction has come true.
In Macbeth’s castle, Lady Macbeth reads a letter from her husband telling her of the events that have just transpired. She resolves to follow her ambitions. A servant announces that Duncan will soon arrive at the castle, and when Macbeth enters, she tells him that they must kill the king. Duncan arrives. Macbeth has a vision of a dagger, then leaves to commit the murder. On his return, he tells his wife how the act has frightened him, and she tells him that he needs more courage. They both leave as Banquo enters with Macduff, a nobleman, who discovers the murder. Macbeth and Lady Macbeth pretend to be horrified and join the others in condemning the murder.
ACT II
Macbeth has become king. Duncan’s son, Malcolm, is suspected of having killed his father and has fled to England. Worried about the prophecy that Banquo’s children will rule, Macbeth and his wife now plan to kill him and his son, Fleance, as well. As Macbeth leaves to prepare the double murder, Lady Macbeth hopes that it will finally make the throne secure.
Outside the castle, assassins wait for Banquo, who appears with his son, warning him of strange forebodings. Banquo is killed, but Fleance escapes.
Lady Macbeth welcomes the court to the banquet hall and sings a drinking song, while Macbeth receives news that Banquo is dead and his son has escaped. About to take Banquo’s seat at the table, Macbeth has a terrifying vision of the dead man accusing him. His wife is unable to calm her unsettled husband, and the courtiers wonder about the king’s strange behavior. Macduff vows to leave the country, which is now ruled by criminals.
ACT III
The witches gather again, and Macbeth visits them, demanding more prophecies. Apparitions warn him to beware of Macduff and assure him that “no man of woman born” can harm him, and that he will be invincible until Birnam Wood marches on his castle. In another vision, he sees a procession of future kings, followed by Banquo. Horrified, Macbeth collapses. The witches disappear and his wife finds him. They resolve to kill Macduff and his family.
ACT IV
On the Scottish border, Macduff has joined the refugees. His wife and children have been killed. Malcolm appears with British troops and leads them to invade Scotland.
Lady Macbeth is sleepwalking, haunted by the horrors of what she and her husband have done.
Macbeth awaits the arrival of his enemies and realizes that he will never live to a peaceful old age. Messengers bring news that Lady Macbeth has died, and that Birnam Wood appears to be moving. English soldiers appear, camouflaged with its branches. Macduff confronts Macbeth and tells him that he was not born naturally but had a Caesarean birth. He kills Macbeth and proclaims Malcolm king of Scotland.