Measure for Measure is among the most passionately discussed of Shakespeare’s plays. 

In it, a duke temporarily removes himself from governing his city-state, deputizing a member of his administration, Angelo, to enforce the laws more rigorously. 

Angelo chooses as his first victim Claudio, condemning him to death because he impregnated Juliet before their marriage.

Claudio’s sister Isabella, who is entering a convent, pleads for her brother’s life. 

Angelo attempts to extort sex from her, but Isabella preserves her chastity. 

The duke, in disguise, eavesdrops as she tells her brother about Angelo’s behavior, then offers to ally himself with her against Angelo.