As promised, Polonius arrives in Gertrude’s room before Hamlet and hides himself behind an arras. He instructs Gertrude to be entirely blunt with her son. Hamlet enters challenging, “Now, Mother, what’s the matter?” Gertrude tells him he has badly offended his father, meaning Claudius; Hamlet answers that she has badly offended his father, meaning King Hamlet. Hamlet intimidates Gertrude, and she cries out that he is trying to murder her. Polonius reacts from behind the curtain and yells for help. Hamlet draws his sword and thrusts it through the tapestry, killing Polonius. When Hamlet lifts the wallhanging and discovers Polonius’ body, he tells the body that he had believed he was stabbing the King. He then turns his attention to punishing Gertrude. He presses contrasting pictures of Claudius and his brother in Gertrude’s face. He points out King Hamlet’s godlike countenance and courage, likening Claudius to an infection in King Hamlet’s ear. He accuses Gertrude of lustfulness, and she begs him to leave her alone.

King Hamlet’s Ghost reappears to Hamlet, but only Hamlet can see him. Hamlet believes that the Ghost has come to chide his tardy son into carrying out the “dread command,” but Hamlet then perceives the Ghost as his mother’s protector. The Ghost tells his son to be kinder to her. Gertrude is utterly convinced now that her son is hallucinating from a devil-inspired madness, but Hamlet tells her that it is not madness that afflicts him. He begs her to confess her guilt to him and to heaven. At the very least, he begs her, don’t sleep with Claudius or let him “go paddling in your neck with his damned fingers.”

He asks if she knows that Claudius is sending him to England; she had forgotten. He tells her that he distrusts Rosencrantz and Guildenstern, and that they are undoubtedly taking him to England to do some foul bidding for Claudius. She confesses that she knows about the exile. He bids his mother good night and exits, pulling Polonius’ body behind him.