Macbeth Act 3

I see Macbeth starting to lose his power.  After he learns that Banquo died as planned but not Fleance, Macbeth begins to see Banquo's ghost at his banquet table.  In addition, Macbeth notices Macduff's absence at the banquet.  People are beginning to realize that Macbeth is probably up to something, and that realization doesn't sit well with Macbeth.  He decides to again turn to the witches for a prophecy of things to come.  Macbeth loses most of his rational reason in this act, something that will eventually lead to his own death.