Rosencrantz and Guildenstern admit that they have failed to find a cause for Hamlets madness. Claudius decides to send Hamlet to England.
Everyone gathers to watch the play. The main elements are the poisoning of the king and the marriage of the poisoner to the kings widow. Claudius rises in alarm and Polonius halts the performance. Hamlet is now convinced the ghosts story is true.
Hamlet decides to postpone killing Claudius until he is found committing an evil act, so that he will go to hell. Polonius hides behind the tapestry in Gertrude's apartment. Hamlet accidentally kills Polonius. He thought he was killing Claudius.