Macbeth and Banquo encounter three witches who prophesize that Macbeth will become king. When King Duncan stays at Macbeth's castle, Lady Macbeth convinces Macbeth to murder Duncan to fulfill the prophecy. They succeed in killing Duncan and framing his guards, allowing Macbeth to take the throne. However, Macbeth grows increasingly paranoid and power-hungry, ordering more murders to protect his crown. His mental state deteriorates as he is plagued by guilt. Eventually, Macduff leads an army against Macbeth and kills him in battle, restoring order to Scotland.