Macbeth plans to overturn the witches’ prophecy that Banquo’s sons will become kings by sending two murders to kill both Banquo and his son, Fleance. (i.) Macbeth no longer needs Lady Macbeth’s involvement and bids her be “innocent of the knowledge” of his decisions. (ii.) A third murderer, obviously not known by the other two, joins them, and although Banquo is slain, Fleance escapes. (iii.) At the banquet, Macbeth is terrified by the bloody ghost of Banquo. Since no one else sees the apparition, Lady Macbeth attempts to excuse his behavior and eventually has to end the banquet. Macbeth determines to visit the witches again. (iv.) Suspicion of Macbeth is mounting, and Macduff joins Malcolm in England. (vi.)
