The story:
Act I.
In Scotland. Macbeth and Banco are returning
from a victorious battle against the rebels. They meet three
witches, who make them a prophecy: Macbeth will be lord of
Cawdor and Banco's offspring will reign. The first prophecy
comes true at once: a messenger arrives, bringing the royal
nomination. At the castle, they await the arrival of the king.
Lady Macbeth urges her husband to kill him.
Act II.
The king has been assassinated. His son
Malcolm is accused of the murder and must flee to England.
Now that Macbeth is king of Scotland, his wife wants to
eliminate Banco and his son Flaenzio. The father is murdered,
but the son manages to escape. During a banquet, Banco's
ghost comes to haunt Macbeth.
Act III.
Macbeth is uneasy, and goes to the witches
to question them. The verdict is obscure: he will remain
lord of Scotland and absolutely invincible until the forest
of Birnam moves against him. Lady Macbeth in the meantime
urges him to kill the wife and children of Macduff who,
with Malcolm, is gathering an army in England to attack
Scotland.
Act IV.
The invading army under Malcolm's and Macduff's
command moves up secretly. Hidden in the forest of Birnam,
the soldiers cut branches to camouflage their advance, ready
for the decisive battle. Lady Macbeth, asleep, is tormented
by bad dreams. Macbeth faces the invaders, but is killed
in a duel. Thus the second prophecy of the witches is fulfilled.