Banquo is unable to sleep due to evil thoughts. Macbeth hints at murdering Banquo but asks for his support. Lady Macbeth grows impatient waiting for Macbeth, who has murdered Duncan. Macbeth is paranoid and hears voices, while Lady Macbeth frames the servants. Everyone discovers Duncan's murder, and Macbeth further implicates himself by hinting he knew about it. Macduff emerges as a threat by openly suspecting Macbeth.