Lady Macbeth summons her husband to her, and the two of them have a heart to heart. They’re both pretty unhappy with their current situation—Lady Macbeth because getting what she wanted hasn’t stopped her worrying, and Macbeth because he’s afraid of what Banquo knows. He tells his wife he’s got a plan to handle the situation, but he doesn’t tell her he’s already put Banquo’s murder into motion. He doesn’t want her to wade any deeper into this mess.