Lady Macbeth reads the letter and decides that she will make this happen. She creates a plan to murder King Duncan.
Macbeth murders King Duncan and regrets it. Malcolm and Donnalbain flee to England and Scotland. Macbeth becomes King but Banquo begins to think something is wrong.
Macbeth and Banquo meet the 'weird sisters' and Macbeth is told he will become Thane of Glamis and King - he likes this and writes a letter to Lady Macbeth, his wife.
Banquo's ghost haunts Macbeth and the Lords and Thanes begin to think that Macbeth is losing his mind. Some of them, lead by Macduff, get an army to kill Macbeth.
'Thou shalt be what thou are promised!' 'Fill me with direst evil' 'False face must hide what the false heart doth know' 'Look like the innocent flower but be the serpent beneath it.'
'Wake Duncan with that Knell for it summons thee to heaven or to hell!' Macbeth begins to sound like the witches whenever he does something bad. This is the influence of the supernatural on Macbeth. 'A simple bit of water clears us of this deed' Lady Macbeth shows no emotion or regret for killing the King. This comes back to haunt her later in the play.
Macbeth has Banquo, his best friend, killed because he suspects Macbeth murdered King Duncan. Macbeth's fear, anger and obsession make him murder his best friend who comes back to haunt him. 'Never shake thy gory locks at me!'