Macbeth (Ian McKellen) is a daring member of the Scottish military who receives a revelation from three menacing sorceresses that he will someday become the King of Scotland. This information gives him a thirst for power, and with prompting from his wife, Lady Macbeth (Dame Judi Dench), he kills the current leader in order to take the throne. But he must continue to commit murders to keep his actions a secret, and soon, no one is safe.