What happens in Measure for Measure
The whole story, start to finish — every act, in plain modern English. This summary follows the play to its ending, so read on once you're ready to know how it closes.
The Duke of Vienna has let the city’s morality laws rot for nineteen years, and crime has spread unchecked. Rather than crack down himself and look like a hypocrite, he announces he is leaving the city and hands absolute power to Angelo, a deputy famous for his cold virtue. The Duke doesn’t actually leave. He borrows a friar’s habit from Friar Thomas, disguises himself, and stays behind to watch how Angelo wields the power he never earned.
Angelo moves fast and hard. He revives an old law that makes sex outside marriage a capital crime, and his first victim is a young man named Claudio. Claudio has gotten his betrothed, Juliet, pregnant before their marriage was formalized, and Angelo sentences him to death. Claudio sends word to his sister Isabella, a novice about to take her vows in a convent. Lucio, a loose-living acquaintance, urges Isabella that only her beauty and eloquence can move Angelo to mercy. She agrees to plead for her brother’s life.
Isabella argues well, too well. Angelo, who has spent his life denying every appetite, is blindsided by desire for her. He summons her back and makes his offer plain: he will spare Claudio only if she sleeps with him. Isabella refuses absolutely, choosing her honor over her brother’s life, and threatens to expose him. Angelo coolly answers that no one will believe her word against his reputation. When she carries the choice to Claudio in prison, he first accepts death bravely, then panics and begs her to give in. She turns on him as a coward and leaves him to die.
The disguised Duke has overheard everything, and he steps in with a plan. Years ago Angelo was engaged to a woman named Mariana, then abandoned her when her dowry was lost at sea. She still loves him. The Duke proposes a bed trick: Isabella will pretend to accept Angelo’s terms, but Mariana will take her place in the dark. The substitution works. Angelo, satisfied, betrays his word anyway and orders Claudio executed at once, demanding his head as proof. The Duke, still a friar, persuades the Provost to behead another condemned prisoner instead. When that man refuses to die sober, a pirate named Ragozine conveniently dies of fever, and his head is sent to Angelo while Claudio stays hidden and alive.
The Duke now stages his return. He announces he will re-enter Vienna openly and hear any complaints at the city gates. Isabella, Mariana, and Friar Peter are positioned to accuse Angelo before the whole court. The Duke, back in his own robes, pretends to disbelieve the women and turns the case over to Angelo himself, then slips away and reappears as the friar, only to be unmasked. Angelo, caught with no way out, confesses and begs for death.
The Duke gives him measure for measure. He orders Angelo to marry Mariana immediately, then condemns him to die exactly as Claudio was condemned. Mariana pleads for her new husband’s life, and Isabella, remarkably, kneels beside her to plead for the man who wronged her. The Duke relents. He reveals Claudio alive, pardons Angelo, and forgives the unrepentant prisoner Barnardine. He sentences the slanderer Lucio to marriage as a punishment, and then turns to Isabella with a marriage proposal of his own. She never answers. Shakespeare ends this dark comedy on her silence, leaving the audience to decide what that silence means.