The Tragedy of Hamlet, Prince of Denmark — Act 4, Scene 5: Elsinore. A room in the castle.

Gertrude, with Horatio and a Gentleman, learns that Ophelia is desperately upset and speaking in broken, suggestive fragments about her father. Gertrude decides to receive her, and Ophelia enters singing songs about death, lost love, and betrayal. Claudius arrives and sees that her mind is unsettled, then sends Horatio to watch her. He explains to Gertrude that her father’s death, Hamlet’s removal, and public anger over Polonius’s burial are all feeding the unrest. Suddenly Laertes bursts in with armed supporters, demanding his father. Claudius tries to calm him and insists he was not responsible. When Ophelia re-enters, Laertes is devastated by her madness. Claudius finally agrees to hear Laertes’s grievance and take it seriously.