Act 3-4: Evidence, Murder, and Consequences
Hamlet's clever plan works perfectly. During the play-within-a-play, Claudius's reaction confirms his guilt when he abruptly stops the performance. However, when Hamlet has the perfect opportunity to kill Claudius whilst he's praying, he hesitates and doesn't take it.
During a heated confrontation with his mother, Hamlet accidentally kills Polonius, who was hiding behind a curtain eavesdropping. This impulsive act changes everything and gives Claudius the perfect excuse to banish Hamlet to England.
Ophelia goes genuinely mad after losing her father and having Hamlet sent away. Her descent into actual madness contrasts sharply with Hamlet's performed insanity. Meanwhile, Laertes returns from France seeking vengeance for his father's death.
Critical Development: Claudius manipulates Laertes's grief and anger, convincing him to challenge Hamlet to a duel with a poison-tipped sword. As backup, Claudius prepares a poisoned drink, ensuring Hamlet's death either way.