ACT II

Scene 1 - Macbeth imagines a dagger before him encouraging him to do the deed, showing him how.
Scene 2 -  

Macbeth kills Duncan and realizes the horror of what he has done.

Scene 2 - Lady Macbeth frames the servants by setting the daggers by them, and smearing them with blood.
Scene 3 -   Macduff discovers the murder, tells everyone of the horror, and calls for an alarm.
Scene 3 - Malcolm and Donalbain both agree it is not safe there and depart.
Scene 4 -   Macduff thinks the servants were paid by Malcolm and Donalbain to kill Duncan.
Scene 4 - Macbeth went to Scone to get the crown.