This is the story of unbridled greed, in which Macbeth receives the prophecy of three witches that he will be King, only to see Banquo's sons succeed him. To ascend the throne, drunk, he architect the murder of King Duncan, with the complicity of Lady Macbeth. Later, while attempting to murder Banquo, they both end up isolated and defeated. Macbeth is a Scottish army general much appreciated by their monarch, King Duncan, for his loyalty and his services warriors. One day, he and Banquo, another general, are approached by three witches, who make the following predictions: Macbeth will be king, Banquo is less important, but more powerful than Macbeth, and Banquo's sons will be kings. Macbeth does not understand the confusing words of the apparitions, but they are silent deep within. He reports the strange encounter to his wife, Lady Macbeth - one of the most perfect villains of literature - that ambitious, wields power over her husband, causing him to commit the fatal act of treason to the king that trigger the tragedy of two and a turnaround in court. Quote dreary repeated several times by witches that torment the main character: "Macbeth! Macbeth! Macbeth." The importance of the perfidy of Lady Macbeth, since Macbeth himself vacillated before the challenges. Hence the "want to be great, and it will not lack ambition, but careces of evil that must accompany this ambition."