Synopsis
Vincentio, the Duke of Vienna, makes it known that he intends to leave the city on a diplomatic mission. He leaves the government in the hands of a strict judge, Angelo.
Claudio, a young nobleman, is betrothed/unofficially married to Juliet. At the time, marriages were supposed to be announced by banns in advance. Due to lack of money, Claudio and Juliet did not observe all the technicalities. This did not make them unique however; at the time most people (including the Church) would have considered them married. Technically, however, all the formalities for a civil marriage had not been followed and so a strict judge might rule that they were not legally married. Angelo, as the personification of the law, decides to enforce the ruling that fornication is punishable by death, and since he does not accept the validity of the marriage, Claudio is sentenced to be executed. Claudio's friend, Lucio, visits Claudio's sister, Isabella, a novice nun, and asks her to intercede with Angelo on Claudio's behalf.
Isabella obtains an audience with Angelo, and pleads for mercy for Claudio. Over the course of two scenes between Angelo and Isabella, it becomes clear that he harbours lustful thoughts about her, and he eventually offers her a deal: Angelo will spare Claudio's life if Isabella yields him her virginity. Isabella refuses, but she also realises that (due to Angelo's austere reputation) she will not be believed if she makes a public accusation against him. Instead she visits her brother in prison and counsels him to prepare himself for death. Claudio vehemently begs Isabella to save his life, but Isabella refuses. As a novice nun, she feels that she cannot sacrifice her own immortal soul (and that of Claudio's, if he causes her to lose her virtue) to save Claudio's transient earthly life.
The Duke has not in fact left the city, but remains there disguised as a friar (Lodowick) in order to spy on the city's affairs, and especially on the actions of Angelo. In his guise as a friar he befriends Isabella and arranges two tricks to thwart Angelo's evil intentions:
- First, a "bed trick" is arranged. Angelo has previously refused to fulfill the betrothal binding him to Mariana, because her dowry had been lost at sea. Isabella sends word to Angelo that she has decided to submit to him, making it a condition of their meeting that it occurs in perfect darkness and in silence. Mariana agrees to take Isabella's place, and she has sex with Angelo, although he continues to believe he has enjoyed Isabella. (In some interpretations of the law, this constitutes consummation of their betrothal, and therefore their marriage. This is the same interpretation that assumes that Claudio and Juliet are legally married.)
- After having sex with Mariana (who he thinks is Isabella), Angelo goes back on his word, sending a message to the prison that he wishes to see Claudio's head, and necessitating the "head trick." The Duke first attempts to arrange the execution of another prisoner whose head can be sent instead of Claudio's. However, the villain Barnardine refuses to be executed in his drunken state. As luck would have it, a pirate named Ragozine, of similar appearance to Claudio, has recently died of a fever, so his head is sent to Angelo instead.
This main plot concludes with the 'return' to Vienna of the Duke as himself. Isabella and Mariana publicly petition him, and he hears their claims against Angelo, which Angelo smoothly denies. As the scene develops, it appears that Friar Lodowick will be blamed for the 'false' accusations levelled against Angelo. The Duke leaves Angelo to judge the cause against Lodowick, but returns in disguise moments later when Lodowick is summoned. Eventually the friar reveals himself to be the Duke, thereby exposing Angelo as a liar and Isabella and Mariana as truthful. He proposes that Angelo be executed but first compels him to marry Mariana— with his estate going to Mariana as her new dowry, "to buy you a better husband". Mariana pleads for Angelo's life, even enlisting the aid of Isabella (who is not yet aware her brother Claudio is still living). The Duke pretends not to heed the women's petition, and only after revealing that Claudio has not, in fact, been executed, relents. The Duke then proposes marriage to Isabella. Isabella does not reply, and her reaction is interpreted differently in different productions: her silent acceptance of his proposal is the most common in performance. This is one of the "open silences" of the play.
A sub-plot concerns Claudio's friend Lucio, who frequently slanders the duke to the friar, and in the last act slanders the friar to the duke, providing opportunities for comic consternation on Vincentio's part and landing Lucio in trouble when it is revealed that the duke and the friar are one and the same. His punishment, like Angelo's, is to be forced into an undesired marriage: in this case with the prostitute Kate Keepdown.
Read more about this topic: Measure For Measure